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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 475 · 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. 1.9 × 4 = 3? — what is the missing digit?
  2. 2.7 × 4 =
  3. 3.Magic square (every row, column and diagonal has the same total): ? 10 15 | 16 12 8 | 9 14 13. What is the missing number?
  4. 4.Double 73 =
  5. 5.123456789 × 8 + 9 =
  6. 6.30 × 4 =
  7. 7.13 × 1000 =
  8. 8.The ages of two twins add up to 8. How old is each twin?
  9. 9.Take 299. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.9 × 8 = ?2 — what is the missing digit?
  11. 11.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 50 (d) 51
  12. 12.3 × 1000 =
  13. 13.Magic trick! Think of 17. Double it, add 12, halve it, then take away 17. What number do you get?
  14. 14.Double 28 =
  15. 15.A father is 33 years old and his son is 5. How old was the father when the son was born?
  16. 16.76 × 100 =
  17. 17.Think of 12. Multiply it by 2, then add 3. What number do you end with?
  18. 18.Magic square (every row, column and diagonal has the same total): 25 4 19 | 10 16 ? | 13 28 7. What is the missing number?
  19. 19.9 × 10 = ?0 — what is the missing digit?
  20. 20.1 + 2 + 3 + … + 31 =
  21. 21.36 × 4 =
  22. 22.792 + 297 =
  23. 23.9 × 10 =
  24. 24.Half of 182 =
  25. 25.9 × 6 = ?4 — what is the missing digit?
  26. 26.9 × 7 = 6? — what is the missing digit?
  27. 27.What comes next? 18, 25, 32, 39, ? (a) 46 (b) 39 (c) 53 (d) 47
  28. 28.12 × 8 + 2 =
  29. 29.62?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.50 × 4 =
  31. 31.Magic square (every row, column and diagonal has the same total): 29 14 ? | 8 20 32 | 23 26 11. What is the missing number?
  32. 32.6 × 9 =
  33. 33.47 × ? = 470
  34. 34.658 × 10 =
  35. 35.39 × 100 =
  36. 36.What comes next? 14, 22, 30, 38, ? (a) 46 (b) 47 (c) 54 (d) 38
  37. 37.1 × 9 =
  38. 38.Magic square (every row, column and diagonal has the same total): 17 15 ? | 27 19 11 | 13 23 21. What is the missing number?
  39. 39.531 × 10 =
  40. 40.1?15 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 6
  2. 28
  3. 11
  4. 146
  5. 987654321
  6. 120
  7. 13000
  8. 4
  9. 693
  10. 7
  11. 49
  12. 3000
  13. 6
  14. 56
  15. 28
  16. 7600
  17. 27
  18. 22
  19. 9
  20. 496
  21. 144
  22. 1089
  23. 90
  24. 91
  25. 5
  26. 3
  27. 46
  28. 98
  29. 9
  30. 200
  31. 17
  32. 54
  33. 10
  34. 6580
  35. 3900
  36. 46
  37. 9
  38. 25
  39. 5310
  40. 2

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