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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 479 · 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.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 98 (c) 100 (d) 102
  2. 2.9 × 8 = 7? — what is the missing digit?
  3. 3.I thought of a number, added 5 and then doubled it. I got 30. What was my number?
  4. 4.Do the 1089 trick with 805: reverse and subtract, then reverse that answer and add. What do you get?
  5. 5.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 64 (d) 62
  6. 6.41 × 4 =
  7. 7.37 × ? = 37000
  8. 8.Double 47 =
  9. 9.Double 35 =
  10. 10.What comes next? 14, 16, 18, 20, ? (a) 22 (b) 20 (c) 24 (d) 23
  11. 11.9 × ? = 9000
  12. 12.7 × 4 =
  13. 13.If today is Friday, what day was it 20 days ago? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  14. 14.9 × 10 = ?0 — what is the missing digit?
  15. 15.837 × 10 =
  16. 16.37 × 6 =
  17. 17.18 × 4 =
  18. 18.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  19. 19.11 × 11 =
  20. 20.The ages of two twins add up to 8. How old is each twin?
  21. 21.Half of 82 =
  22. 22.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
  23. 23.9 × 3 = ?7 — what is the missing digit?
  24. 24.Magic square (every row, column and diagonal has the same total): 12 5 10 | 7 9 11 | 8 13 ?. What is the missing number?
  25. 25.37 × 15 =
  26. 26.750 × 10 =
  27. 27.9 × 5 = 4? — what is the missing digit?
  28. 28.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  29. 29.32?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Magic square (every row, column and diagonal has the same total): 7 ? 3 | 2 6 10 | 9 4 5. What is the missing number?
  31. 31.9 × 9 =
  32. 32.Think of 3. Multiply it by 2, then add 5. What number do you end with?
  33. 33.43 × ? = 4300
  34. 34.The ages of two twins add up to 18. How old is each twin?
  35. 35.19 × 4 =
  36. 36.1 + 2 + 3 + … + 53 =
  37. 37.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 42 (c) 36 (d) 48
  38. 38.1 + 2 + 3 + … + 79 =
  39. 39.Magic trick! Think of 10. Double it, add 18, halve it, then take away 10. What number do you get?
  40. 40.27 × 4 =

Answer key

  1. 100
  2. 2
  3. 10
  4. 1089
  5. 64
  6. 164
  7. 1000
  8. 94
  9. 70
  10. 22
  11. 1000
  12. 28
  13. Saturday
  14. 9
  15. 8370
  16. 222
  17. 72
  18. 5
  19. 121
  20. 4
  21. 41
  22. 1089
  23. 2
  24. 6
  25. 555
  26. 7500
  27. 5
  28. 5
  29. 1
  30. 8
  31. 81
  32. 11
  33. 100
  34. 9
  35. 76
  36. 1431
  37. 48
  38. 3160
  39. 9
  40. 108

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