← Mixed mental challenge lesson New set →

Mental Maths Questions Worksheet for Class 5

Mental maths lesson 19: Mixed mental challenge · Set 632 · 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. 1.288 ÷ 8 =
  2. 2.Best estimate of 834 + 420? (a) 1000 (b) 1200 (c) 1400
  3. 3.A film starts at 2:05 and ends at 4:25. How many minutes long is the film?
  4. 4.Best estimate of 48 × 80? (a) 40000 (b) 4000 (c) 400
  5. 5.Best estimate of 93 × 86? (a) 81000 (b) 810 (c) 8100
  6. 6.You buy a bag of mangoes for ₹251 and pay with a ₹500 note. How much change do you get, in rupees?
  7. 7.Best estimate of 455 + 284? (a) 800 (b) 1000 (c) 600
  8. 8.16² =
  9. 9.17 + 5 =
  10. 10.Half of 100 =
  11. 11.You buy a box of crayons for ₹38 and a pen for ₹22. You pay with a ₹100 note. How much change do you get, in rupees?
  12. 12.73 − 9 =
  13. 13.89 + ? = 100
  14. 14.Best estimate of 690 + 274? (a) 1200 (b) 800 (c) 1000
  15. 15.61 − 9 =
  16. 16.Best estimate of 320 + 745? (a) 1200 (b) 1000 (c) 800
  17. 17.244 ÷ 4 =
  18. 18.68 + 4 =
  19. 19.7 + ? = 10
  20. 20.Double 48 =
  21. 21.8 + 7 =
  22. 22.You buy a notebook for ₹34 and a pen for ₹17. You pay with a ₹100 note. How much change do you get, in rupees?
  23. 23.77 + 5 =
  24. 24.110 − 83 =
  25. 25.59 − 45 =
  26. 26.19² =
  27. 27.47 + 29 =
  28. 28.6 + 5 =
  29. 29.124 ÷ 4 =
  30. 30.You buy a pencil box for ₹416 and pay with a ₹500 note. How much change do you get, in rupees?
  31. 31.38 × 8 =
  32. 32.272 ÷ 8 =
  33. 33.A cricket match starts at 4:10 and the first innings ends at 5:25. How many minutes did the innings last?
  34. 34.12 × 8 =
  35. 35.A train leaves at 5:05 and reaches the next city at 6:35. How many minutes is the journey?
  36. 36.24² =
  37. 37.Half of 148 =
  38. 38.28 + 3 =
  39. 39.Best estimate of 275 + 738? (a) 1200 (b) 1000 (c) 800
  40. 40.37 children stand in rows of 4. How many full rows can they make?

Answer key

  1. 36
  2. 1200
  3. 140
  4. 4000
  5. 8100
  6. 249
  7. 800
  8. 256
  9. 22
  10. 50
  11. 40
  12. 64
  13. 11
  14. 1000
  15. 52
  16. 1000
  17. 61
  18. 72
  19. 3
  20. 96
  21. 15
  22. 49
  23. 82
  24. 27
  25. 14
  26. 361
  27. 76
  28. 11
  29. 31
  30. 84
  31. 304
  32. 34
  33. 75
  34. 96
  35. 90
  36. 576
  37. 74
  38. 31
  39. 1000
  40. 9

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths