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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 655 · 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 × 10 = ?0 — what is the missing digit?
  2. 2.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
  3. 3.55 × 4 =
  4. 4.9 × 4 = 3? — what is the missing digit?
  5. 5.Think of 15. Multiply it by 3, then add 2. What number do you end with?
  6. 6.9 × 3 =
  7. 7.Double 24 =
  8. 8.Half of 14 =
  9. 9.17 × 4 =
  10. 10.1 + 3 + 5 + … + 23 =
  11. 11.Magic trick! Think of 17. Double it, add 4, halve it, then take away 17. What number do you get?
  12. 12.9 × 8 = ?2 — what is the missing digit?
  13. 13.Double 41 =
  14. 14.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 16 (c) 14 (d) 12
  15. 15.1 + 2 + 3 + … + 69 =
  16. 16.Magic square (every row, column and diagonal has the same total): 9 ? 17 | 19 11 3 | 5 15 13. What is the missing number?
  17. 17.Double 29 =
  18. 18.9 × 3 = 2? — what is the missing digit?
  19. 19.?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.58 × 4 =
  21. 21.20 × 4 =
  22. 22.?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.I thought of a number, multiplied it by 5 and added 2. I got 77. What was my number?
  24. 24.9 × 5 =
  25. 25.Half of 174 =
  26. 26.12 × 8 + 2 =
  27. 27.1 + 2 + 3 + … + 20 =
  28. 28.37 × ? = 37000
  29. 29.12 × 9 + 3 =
  30. 30.9 × 3 = ?7 — what is the missing digit?
  31. 31.Double 94 =
  32. 32.96 × ? = 9600
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  34. 34.8 × 9 =
  35. 35.Double 18 =
  36. 36.Magic square (every row, column and diagonal has the same total): 20 ? 14 | 17 23 29 | 32 11 26. What is the missing number?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  38. 38.9 × 9 = 8? — what is the missing digit?
  39. 39.934 × ? = 9340
  40. 40.Magic square (every row, column and diagonal has the same total): 6 1 8 | 7 5 3 | 2 9 ?. What is the missing number?

Answer key

  1. 9
  2. 48
  3. 220
  4. 6
  5. 47
  6. 27
  7. 48
  8. 7
  9. 68
  10. 144
  11. 2
  12. 7
  13. 82
  14. 16
  15. 2415
  16. 7
  17. 58
  18. 7
  19. 6
  20. 232
  21. 80
  22. 2
  23. 15
  24. 45
  25. 87
  26. 98
  27. 210
  28. 1000
  29. 111
  30. 2
  31. 188
  32. 100
  33. 396
  34. 72
  35. 36
  36. 35
  37. 693
  38. 1
  39. 10
  40. 4

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