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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 405 · 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 69 =
  2. 2.6 × 9 =
  3. 3.What comes next? 14, 21, 28, 35, ? (a) 42 (b) 49 (c) 43 (d) 35
  4. 4.600? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.599? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.9 × 7 =
  7. 7.Take 83 and take away the sum of its digits. What do you get?
  8. 8.What comes next? 4, 8, 12, 16, ? (a) 21 (b) 24 (c) 20 (d) 16
  9. 9.2 × 9 =
  10. 10.In 2 years a boy will be 16 years old. How old was he 6 years ago?
  11. 11.Take 87 and take away the sum of its digits. What do you get?
  12. 12.1 + 2 + 3 + … + 23 =
  13. 13.Double 68 =
  14. 14.17 × 4 =
  15. 15.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 14 (d) 17
  16. 16.25 × 4 =
  17. 17.14 × 1000 =
  18. 18.In 3 years a boy will be 16 years old. How old was he 2 years ago?
  19. 19.1 × 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): ? 19 9 | 7 15 23 | 21 11 13. What is the missing number?
  21. 21.7 × 9 =
  22. 22.3 × 9 =
  23. 23.Magic square (every row, column and diagonal has the same total): ? 6 8 | 2 10 18 | 12 14 4. What is the missing number?
  24. 24.36 × 4 =
  25. 25.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
  26. 26.65?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Double 35 =
  28. 28.37 × 21 =
  29. 29.43 × 4 =
  30. 30.I thought of a number, multiplied it by 3 and added 2. I got 8. What was my number?
  31. 31.I thought of a number, multiplied it by 4 and added 2. I got 34. What was my number?
  32. 32.123 × 8 + 3 =
  33. 33.19 × 4 =
  34. 34.628 × ? = 6280
  35. 35.Take 234. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 38 (d) 34
  37. 37.15 × 4 =
  38. 38.39 × 4 =
  39. 39.9 × 8 = ?2 — what is the missing digit?
  40. 40.693 + 396 =

Answer key

  1. 138
  2. 54
  3. 42
  4. 3
  5. 4
  6. 63
  7. 72
  8. 20
  9. 18
  10. 8
  11. 72
  12. 276
  13. 136
  14. 68
  15. 16
  16. 100
  17. 14000
  18. 11
  19. 9
  20. 17
  21. 63
  22. 27
  23. 16
  24. 144
  25. 80
  26. 8
  27. 70
  28. 777
  29. 172
  30. 2
  31. 8
  32. 987
  33. 76
  34. 10
  35. 198
  36. 36
  37. 60
  38. 156
  39. 7
  40. 1089

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