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Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 109 · 40 questions
TalentJR

How to do it in your head (Look first): A 9, 19 or 99 → round and adjust. Two close numbers → count up (or near doubles when adding). × or ÷ by 4 or 8 → double or halve; other sums → split into tens and ones.

NameDateTime takenScore ___ / 40
  1. 1.25 × 8 =
  2. 2.5 + 9 =
  3. 3.45 × 4 =
  4. 4.Double 29 =
  5. 5.80 + ? = 100
  6. 6.Best estimate of 67 × 19? (a) 14000 (b) 140 (c) 1400
  7. 7.Half of 170 =
  8. 8.Half of 198 =
  9. 9.69 × 4 =
  10. 10.65 + 6 =
  11. 11.23 × 8 =
  12. 12.Best estimate of 155 + 508? (a) 900 (b) 700 (c) 500
  13. 13.64 × 5 =
  14. 14.86 + 8 =
  15. 15.213 − 197 =
  16. 16.39 children stand in rows of 4. How many full rows can they make?
  17. 17.14 × 4 =
  18. 18.39 + ? = 100
  19. 19.3 + ? = 10
  20. 20.6 + 5 =
  21. 21.205 − 186 =
  22. 22.19 × 4 =
  23. 23.6 + 8 =
  24. 24.48 × 7 =
  25. 25.62 + 28 =
  26. 26.128 ÷ 8 =
  27. 27.711 ÷ 9 =
  28. 28.6 + ? = 10
  29. 29.20 × 4 =
  30. 30.384 ÷ 6 =
  31. 31.37 × 8 =
  32. 32.36 × 4 =
  33. 33.Double 53 =
  34. 34.A cricket match starts at 3:40 and the first innings ends at 5:05. How many minutes did the innings last?
  35. 35.30 × 8 =
  36. 36.38 children stand in rows of 8. How many full rows can they make?
  37. 37.You buy a box of crayons for ₹37 and pay with a ₹100 note. How much change do you get, in rupees?
  38. 38.Best estimate of 854 + 236? (a) 900 (b) 1100 (c) 1300
  39. 39.2 + ? = 10
  40. 40.340 ÷ 4 =

Answer key

  1. 200
  2. 14
  3. 180
  4. 58
  5. 20
  6. 1400
  7. 85
  8. 99
  9. 276
  10. 71
  11. 184
  12. 700
  13. 320
  14. 94
  15. 16
  16. 9
  17. 56
  18. 61
  19. 7
  20. 11
  21. 19
  22. 76
  23. 14
  24. 336
  25. 90
  26. 16
  27. 79
  28. 4
  29. 80
  30. 64
  31. 296
  32. 144
  33. 106
  34. 85
  35. 240
  36. 4
  37. 63
  38. 1100
  39. 8
  40. 85

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