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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 562 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.Double 99 =
  2. 2.440? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.9 × 5 = ?5 — what is the missing digit?
  4. 4.5 × 1000 =
  5. 5.Half of 52 =
  6. 6.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 80 (d) 70
  7. 7.7 × 9 =
  8. 8.26 × 1000 =
  9. 9.A father is 40 years old and his son is 6. How old was the father when the son was born?
  10. 10.9 × 2 = ?8 — what is the missing digit?
  11. 11.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  12. 12.1 + 2 + 3 + … + 58 =
  13. 13.24 × ? = 24000
  14. 14.1 + 2 + 3 + … + 67 =
  15. 15.1 + 3 + 5 + … + 35 =
  16. 16.9 × 4 = ?6 — what is the missing digit?
  17. 17.Take 307. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.27 × 4 =
  19. 19.26 × ? = 26000
  20. 20.Magic square (every row, column and diagonal has the same total): 9 4 11 | 10 8 6 | 5 ? 7. What is the missing number?
  21. 21.Magic square (every row, column and diagonal has the same total): 13 ? 19 | 28 22 16 | 25 10 31. What is the missing number?
  22. 22.9 × 10 = 9? — what is the missing digit?
  23. 23.Magic trick! Think of 5. Double it, add 18, halve it, then take away 5. What number do you get?
  24. 24.1 + 2 + 3 + … + 8 =
  25. 25.11111 × 11111 =
  26. 26.5 × 9 =
  27. 27.9 × 9 =
  28. 28.Double 39 =
  29. 29.4 × 9 =
  30. 30.37 × 3 =
  31. 31.A father is 36 years old and his son is 6. How old was the father when the son was born?
  32. 32.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 66 (c) 65 (d) 62
  33. 33.2 × 9 =
  34. 34.Half of 166 =
  35. 35.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 102 (c) 98 (d) 101
  36. 36.Double 17 =
  37. 37.13 × 4 =
  38. 38.?223 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.17 × 4 =
  40. 40.Magic trick! Think of 10. Double it, add 6, halve it, then take away 10. What number do you get?

Answer key

  1. 198
  2. 1
  3. 4
  4. 5000
  5. 26
  6. 80
  7. 63
  8. 26000
  9. 34
  10. 1
  11. 4
  12. 1711
  13. 1000
  14. 2278
  15. 324
  16. 3
  17. 396
  18. 108
  19. 1000
  20. 12
  21. 34
  22. 0
  23. 9
  24. 36
  25. 123454321
  26. 45
  27. 81
  28. 78
  29. 36
  30. 111
  31. 30
  32. 64
  33. 18
  34. 83
  35. 100
  36. 34
  37. 52
  38. 2
  39. 68
  40. 3

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