Course module

Numerical Ability & Problem Solving — RSSB Informatics Assistant (सूचना सहायक)

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Lessons
657
Duration
98 hr 37 min
PYQs
20
Practice
1747

10% of this course's PYQ weight is covered in this module.

Syllabus index

Lessons in this module

Speed Mathematics and Basic Mathematics

Speed Math

  1. Find Square Root of Any Number in Just 5 SecondsDrm Video
  2. Multiply 2-Digit Numbers in Just 5 SecondsDrm Video
  3. Multiply 3-Digit Numbers in Just 5 SecondsDrm Video
  4. Find Square Root of Imperfect Numbers in Just 10 SecondsDrm Video
  5. Tricks to Calculate Number of Triangles in Any FigureDrm Video
  6. Tricks to Calculate Number of Triangles in Any Figure (2)Drm Video
  7. Tricks to Calculate Number of Triangles in Any Figure (3)Drm Video
  8. Tricks to Find No. of Triangles & Squares in Any FigureDrm Video
  9. Trick To Check if a Number is Divisible by 7 or NotDrm Video
  10. Short Trick to find angle between hands of a clockDrm Video
  11. More Short Tricks for Fast CalculationDrm Video
  12. More Short Tricks for Fast CalculationPdf
  13. Short Trick to find angle between hands of a clockPdf
  14. Trick To Check if a Number is Divisible by 7 or NotPdf
  15. Tricks to Find No. of Triangles & Squares in Any FigurePdf
  16. Tricks to Calculate Number of Triangles in Any Figure (3)Pdf
  17. Tricks to Calculate Number of Triangles in Any Figure (2)Pdf
  18. Tricks to Calculate Number of Triangles in Any FigurePdf
  19. Find Square Root of Imperfect Numbers in Just 10 SecondsPdf
  20. Multiply 3-Digit Numbers in Just 5 SecondsPdf
  21. Multiply 2-Digit Numbers in Just 5 SecondsPdf
  22. Find Square Root of Any Number in Just 5 SecondsPdf

Arithmetic

Number System

HCF LCM

Finding HCF

  1. [Notes] Another Short Trick to find HCF of Big NumbersPdf
  2. Another Short Trick to find HCF of Big NumbersDrm Video
  3. Short Trick to find HCF by using smallest elementDrm Video
  4. How to find HCF Quickly with the help of given optionsDrm Video
  5. Short Trick to find HCF of Big NumbersDrm Video
  6. Short Trick to find HCF using Co-Prime Numbers ConceptDrm Video
  7. [Notes] Short Trick to find HCF using Co-Prime Numbers ConceptPdf
  8. [Notes] Short Trick to find HCF of Big NumbersPdf
  9. [Notes] How to find HCF Quickly with the help of given optionsPdf
  10. [Notes] Short Trick to find HCF by using smallest elementPdf
  11. [Notes] Short Trick to find HCF by minimum difference methodPdf
  12. [Notes] Trick to find HCF by Long Division MethodPdf
  13. [Notes] Tricks for HCF by Inspection, HCF by Prime FactorizationPdf
  14. Demo: Tricks for HCF by Inspection, HCF by Prime FactorizationStandard Video
  15. Demo: Trick to find HCF by Long Division MethodStandard Video
  16. Demo: Short Trick to find HCF by minimum difference methodStandard Video

Divisibility Rules

Divisibility Rules for all Numbers

  1. Divisibility Rules of 8, 9, 10 and 11Drm Video
  2. Divisibility Rules of 11, 12 and 13Drm Video
  3. Amazing Short Trick for Divisibility of 7 and 13Drm Video
  4. All Divisibility Rules of 13 in a single videoDrm Video
  5. Divisibility Rules of 14 and 15Drm Video
  6. Divisibility Rules of 16Drm Video
  7. Divisibility Rules of 17 and 18Drm Video
  8. Divisibility Rules of 19Drm Video
  9. Divisibility Rules of 20, 21, 22 and 23Drm Video
  10. Divisibility Rules of 24, 25 and 26Drm Video
  11. Divisibility Rules of 27Drm Video
  12. Divisibility Rules of 28, 29, 30 and 31Drm Video
  13. Divisibility Rules of 37, 41 and 43Drm Video
  14. Short Trick to remember divisibility rules from 11 to 50Drm Video
  15. Divisibility Rules of Important Numbers From 31 to 1000Drm Video
  16. [Notes] Short Trick to remember divisibility rules from 11 to 50Pdf
  17. [Notes] Divisibility Rules of 37, 41 and 43Pdf
  18. [Notes] Divisibility Rules of 28, 29, 30 and 31Pdf
  19. [Notes] Divisibility Rules of 27Pdf
  20. [Notes] Divisibility Rules of 24, 25 and 26Pdf
  21. [Notes] Divisibility Rules of 20, 21, 22 and 23Pdf
  22. [Notes] Divisibility Rules of 19Pdf
  23. [Notes] Divisibility Rules of 17 and 18Pdf
  24. [Notes] Divisibility Rules of 16Pdf
  25. [Notes] Divisibility Rules of 14 and 15Pdf
  26. [Notes] All Divisibility Rules of 13 in a single videoPdf
  27. [Notes] Amazing Short Trick for Divisibility of 7 and 13Pdf
  28. [Notes] Divisibility Rules of 11, 12 and 13Pdf
  29. [Notes] Divisibility Rules of 8, 9, 10 and 11Pdf
  30. [Notes] Divisibility Rules of 5, 6 and 7Pdf
  31. [Notes] Divisibility Rules of 2, 3 and 4Pdf
  32. [Notes] Divisibility Rules of Important Numbers From 31 to 1000Pdf
  33. Demo: Divisibility Rules of 2, 3 and 4Standard Video
  34. Demo: Divisibility Rules of 5, 6 and 7Standard Video

Percentage

Conversion Between Fractions (Ratio) & Percentages

  1. Short Tricks to Remember Ratio to Percentage Table Part 1Drm Video
  2. Short Tricks to Remember Ratio to Percentage Table Part 2Drm Video
  3. Short Tricks to Remember Ratio to Percentage Table Part 3Drm Video
  4. Short Tricks to Remember Ratio to Percentage Table Part 4Drm Video
  5. Practice Problems on Ratio to Percentage ConversionDrm Video
  6. Practice Problems on Percentage to Ratio ConversionDrm Video
  7. Question on Ratio to Percentage ConversionDrm Video
  8. Important Property, Trick to find 10 & 1 percent of any numberDrm Video
  9. [Notes] Important Property, Trick to find 10 & 1 percent of any numberPdf
  10. [Notes] Question on Ratio to Percentage ConversionPdf
  11. [Notes] Practice Problems on Percentage to Ratio ConversionPdf
  12. [Notes] Practice Problems on Ratio to Percentage ConversionPdf
  13. [Notes] Short Tricks to Remember Ratio to Percentage Table Part 3Pdf
  14. [Notes] Short Tricks to Remember Ratio to Percentage Table Part 2Pdf
  15. [Notes] Short Tricks to Remember Ratio to Percentage Table Part 1Pdf
  16. [Notes] Basics of Percentages, Percentage - Fraction ConversionsPdf
  17. [Notes] Short Tricks to Remember Ratio to Percentage Table Part 4Pdf
  18. Demo: Basics of Percentages, Percentage - Fraction ConversionsStandard Video

Ratio and Proportion (Ratios)

Average

Profit and Loss

Simple Interest and Compound Interest

Simple Interest – Applications

  1. Tricks & Questions on money becoming multiple times on SIDrm Video
  2. Questions on Extra Amount Received on Extra Interest RateDrm Video
  3. Short Trick for Questions on Variable Rate of InterestDrm Video
  4. Short Trick for Questions on Difference in SIDrm Video
  5. Short Trick for Questions on Difference in AmountDrm Video
  6. Questions on Principal Money Divided into PartsDrm Video
  7. Simple Interest Important Practice Questions (Set 2)Drm Video
  8. [Notes] Simple Interest Important Practice Questions (Set 2)Pdf
  9. [Notes] Questions on Principal Money Divided into PartsPdf
  10. [Notes] Short Trick for Questions on Difference in AmountPdf
  11. [Notes] Short Trick for Questions on Difference in SIPdf
  12. [Notes] Short Trick for Questions on Variable Rate of InterestPdf
  13. [Notes] Questions on Extra Amount Received on Extra Interest RatePdf
  14. [Notes] Tricks & Questions on money becoming multiple times on SIPdf

Mixture and Alligation

Alligation Rule (Core Concept + Two-Ingredient Mixture)

  1. What is Mixture & AlligationDrm Video
  2. TCS Previous Year Question on Alligation RuleDrm Video
  3. WIPRO Previous Year Question on Alligation RuleDrm Video
  4. Where to apply Alligation Rule (Applications)Drm Video
  5. BANK PO & AMCAT Previous Year Question on Alligation RuleDrm Video
  6. GATE Exam (Mechanical) Asked Question on Alligation RuleDrm Video
  7. COGNIZANT & ACCENTURE Asked Questions on Alligation RuleDrm Video
  8. [Notes] TCS Previous Year Question on Alligation RulePdf
  9. [Notes] Where to apply Alligation Rule (Applications)Pdf
  10. [Notes] What is Mixture & AlligationPdf
  11. [Notes] BANK PO & AMCAT Previous Year Question on Alligation RulePdf
  12. [Notes] COGNIZANT & ACCENTURE Asked Questions on Alligation RulePdf
  13. [Notes] GATE Exam (Mechanical) Asked Question on Alligation RulePdf
  14. [Notes] WIPRO Previous Year Question on Alligation RulePdf

Profit–Loss Based Alligation (Cost Price, Selling at CP, Fake Profit)

  1. Solving PROFIT & LOSS Questions Using Alligation RuleDrm Video
  2. Water mixed to a mixture & sold at CP to make profit (1)Drm Video
  3. Water mixed to a mixture & sold at CP to make profit (2)Drm Video
  4. Water mixed to a mixture & sold at CP to make profit (3)Drm Video
  5. Selling item in 2 parts with given profit% or loss% (1)Drm Video
  6. Selling item in 2 parts with given profit% or loss% (2)Drm Video
  7. Selling item in 2 parts with given profit% or loss% (3)Drm Video
  8. [Notes] Selling item in 2 parts with given profit% or loss% (3)Pdf
  9. [Notes] Selling item in 2 parts with given profit% or loss% (2)Pdf
  10. [Notes] Selling item in 2 parts with given profit% or loss% (1)Pdf
  11. [Notes] Water mixed to a mixture & sold at CP to make profit (3)Pdf
  12. [Notes] Water mixed to a mixture & sold at CP to make profit (2)Pdf
  13. [Notes] Water mixed to a mixture & sold at CP to make profit (1)Pdf
  14. [Notes] Solving PROFIT & LOSS Questions Using Alligation RulePdf

Time and Work

Pipe and Cistern

Basic Concepts, Formulas and Terminology

  1. Pipes & CisternsDrm Video
  2. [Notes] Pipes & CisternsPdf

Speed Time and Distance

Average Speed

  1. Concept & Short Tricks to calculate AVERAGE SPEED (1)Drm Video
  2. Concept & Short Tricks to calculate AVERAGE SPEED (2)Drm Video
  3. Concept & Short Tricks to calculate AVERAGE SPEED (3)Drm Video
  4. Important Practice Questions on AVERAGE SPEED (1)Drm Video
  5. Important Practice Questions on AVERAGE SPEED (2)Drm Video
  6. Important Practice Questions on AVERAGE SPEED (3)Drm Video
  7. Average - Short Tricks to Find Average SpeedDrm Video
  8. [Notes] Important Practice Questions on AVERAGE SPEED (3)Pdf
  9. [Notes] Important Practice Questions on AVERAGE SPEED (2)Pdf
  10. [Notes] Important Practice Questions on AVERAGE SPEED (1)Pdf
  11. [Notes] Concept & Short Tricks to calculate AVERAGE SPEED (3)Pdf
  12. [Notes] Concept & Short Tricks to calculate AVERAGE SPEED (2)Pdf
  13. [Notes] Concept & Short Tricks to calculate AVERAGE SPEED (1)Pdf
  14. [Notes] Average - Short Tricks to Find Average SpeedPdf

Train Problems

  1. Concept of Relative Speed Required for Problem on TrainsDrm Video
  2. Important Question & Short Trick on Train Problems (3)Drm Video
  3. Short Trick To Solve Problem on StoppagesDrm Video
  4. Conventions To Solve Problems on Train + Tricky QuestionsDrm Video
  5. Case 2_ Train Crossing a Platform, Bridge or TunnelDrm Video
  6. Important Question & Short Trick on Train Problems (2)Drm Video
  7. Case 3_ Two Trains Crossing One Other(Opposite Direction)Drm Video
  8. Important Question & Short Trick on Train Problems (1)Drm Video
  9. Case 4_ Two Trains Crossing One Other (Same Direction)Drm Video
  10. Case 1_ Train Crossing a stationary pole, signal or manDrm Video
  11. [Notes] Important Question & Short Trick on Train Problems (3)Pdf
  12. [Notes] Important Question & Short Trick on Train Problems (2)Pdf
  13. [Notes] Case 1_ Train Crossing a stationary pole, signal or manPdf
  14. [Notes] Case 3_ Two Trains Crossing One Other(Opposite Direction)Pdf
  15. [Notes] Case 4_ Two Trains Crossing One Other (Same Direction)Pdf
  16. [Notes] Conventions To Solve Problems on Train + Tricky QuestionsPdf
  17. [Notes] Important Question & Short Trick on Train Problems (1)Pdf
  18. [Notes] Short Trick To Solve Problem on StoppagesPdf
  19. [Notes] Case 2_ Train Crossing a Platform, Bridge or TunnelPdf
  20. [Notes] Concept of Relative Speed Required for Problem on TrainsPdf

Age Problems

Partnership

Data Interpretation

Mental Ability

Sequence and Series (Series)

Powers and Exponents (Surds and Indices)

Algebra

Statistics

Mean, Median, and Mode for grouped data

  1. Advance ConceptsDrm Video
  2. [Notes] Advance ConceptsPdf

Logarithm

Solving Logarithmic Expressions and Equations

  1. Set 1 - Important Questions on LogarithmsDrm Video
  2. Set 2 - Important Questions on LogarithmsDrm Video
  3. Set 3 - Important Questions on LogarithmsDrm Video
  4. Set 4 - Important Questions on LogarithmsDrm Video
  5. Set 5 - Important Questions on LogarithmsDrm Video
  6. Set 6- Important Questions on LogarithmsDrm Video
  7. GATE 2018 - Computer Science - Logarithm - 2 MarksDrm Video
  8. [Notes] Set 6- Important Questions on LogarithmsPdf
  9. [Notes] Set 5 - Important Questions on LogarithmsPdf
  10. [Notes] Set 4 - Important Questions on LogarithmsPdf
  11. [Notes] Set 3 - Important Questions on LogarithmsPdf
  12. [Notes] Set 2 - Important Questions on LogarithmsPdf
  13. [Notes] Set 1 - Important Questions on LogarithmsPdf
  14. 12 Logarithm (Quick Revision & Practice Problems)Drm Video
  15. [Notes] 12 Logarithm (Quick Revision & Practice Problems)Pdf

Mensuration and Geometry

Permutation and Combination

Permutations (with & without Repetition)

  1. Permutations with Limited RepetitionsDrm Video
  2. Tricks to Solve The Famous MISSISSIPPI Problem in P&CDrm Video
  3. Vowels & Consonants Type Questions in P&CDrm Video
  4. Tricks to Solve Questions on Arrangement of LettersDrm Video
  5. Tricks to Solve Questions on Arrangement of Digits (1)Drm Video
  6. Tricks to Solve Questions on Arrangement of Digits (2)Drm Video
  7. [Notes] Tricks to Solve Questions on Arrangement of Digits (2)Pdf
  8. [Notes] Tricks to Solve Questions on Arrangement of Digits (1)Pdf
  9. [Notes] Tricks to Solve Questions on Arrangement of LettersPdf
  10. [Notes] Vowels & Consonants Type Questions in P&CPdf
  11. [Notes] Tricks to Solve The Famous MISSISSIPPI Problem in P&CPdf
  12. [Notes] Permutations with Limited RepetitionsPdf
  13. [Notes] Permutations with Unlimited RepetitionsPdf
  14. [Notes] Permutations with No RepetitionPdf
  15. Demo: Permutations with No RepetitionStandard Video
  16. Demo: Permutations with Unlimited RepetitionsStandard Video

Special Applied Problems

  1. Tricks to Solve Questions on Binary StringsDrm Video
  2. Trick for Sum of all numbers formed from given digitsDrm Video
  3. Finding Rank of a Word (Concept + Short Trick)Drm Video
  4. Question on Finding Rank of a Word Without RepetitionDrm Video
  5. Short Trick to Find Rank of a Word With RepetitionsDrm Video
  6. Short Trick to Find Number of HandshakesDrm Video
  7. Chocolate Picking ProblemDrm Video
  8. Counting Sticks ApproachDrm Video
  9. Short Tricks to Solve Dice Sum Problem (1)Drm Video
  10. Short Tricks to Solve Dice Sum Problem (2)Drm Video
  11. Conventional Method of Solving Dice Sum ProblemDrm Video
  12. Short Tricks for Alphabet Selection Problem in P&CDrm Video
  13. [Notes] Short Tricks for Alphabet Selection Problem in P&CPdf
  14. [Notes] Conventional Method of Solving Dice Sum ProblemPdf
  15. [Notes] Short Tricks to Solve Dice Sum Problem (2)Pdf
  16. [Notes] Short Tricks to Solve Dice Sum Problem (1)Pdf
  17. [Notes] Counting Sticks ApproachPdf
  18. [Notes] Chocolate Picking ProblemPdf
  19. [Notes] Short Trick to Find Number of HandshakesPdf
  20. [Notes] Short Trick to Find Rank of a Word With RepetitionsPdf
  21. [Notes] Question on Finding Rank of a Word Without RepetitionPdf
  22. [Notes] Finding Rank of a Word (Concept + Short Trick)Pdf
  23. [Notes] Trick for Sum of all numbers formed from given digitsPdf
  24. [Notes] Tricks to Solve Questions on Binary StringsPdf

Probability

Combinatorics

Previous-year questions

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