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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 451 · 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. 1.41 × 4 =
  2. 2.1 × 9 =
  3. 3.669 × ? = 6690
  4. 4.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
  5. 5.285? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.Magic square (every row, column and diagonal has the same total): ? 17 12 | 15 13 11 | 14 9 16. What is the missing number?
  7. 7.47 × 4 =
  8. 8.A girl is 8 years old and her brother is 6 years older. How old will her brother be in 9 years?
  9. 9.12345679 × 63 =
  10. 10.8 × 9 =
  11. 11.Half of 94 =
  12. 12.36 × 4 =
  13. 13.55 × 4 =
  14. 14.88 × 100 =
  15. 15.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 45 (c) 36 (d) 23
  16. 16.9 × 1 =
  17. 17.72?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 17 (c) 16 (d) 14
  19. 19.96 × 100 =
  20. 20.Take 129. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.9 × 8 =
  22. 22.1 + 2 + 3 + … + 57 =
  23. 23.Think of 8. Multiply it by 4, then add 8. What number do you end with?
  24. 24.A father is 35 years old and his son is 8. How old was the father when the son was born?
  25. 25.43 × 1000 =
  26. 26.77?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.1 + 2 + 3 + … + 38 =
  28. 28.1 + 3 + 5 + … + 31 =
  29. 29.I thought of a number, added 6 and then doubled it. I got 30. What was my number?
  30. 30.Magic trick! Think of 5. Double it, add 14, halve it, then take away 5. What number do you get?
  31. 31.17 × 4 =
  32. 32.Take 27 and take away the sum of its digits. What do you get?
  33. 33.7 × 9 =
  34. 34.Take 72 and take away the sum of its digits. What do you get?
  35. 35.9 × 4 = 3? — what is the missing digit?
  36. 36.What comes next? 17, 20, 23, 26, ? (a) 32 (b) 30 (c) 29 (d) 26
  37. 37.123 × 9 + 4 =
  38. 38.34?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 49 (c) 51 (d) 47
  40. 40.626 × 10 =

Answer key

  1. 164
  2. 9
  3. 10
  4. 5
  5. 3
  6. 10
  7. 188
  8. 23
  9. 777777777
  10. 72
  11. 47
  12. 144
  13. 220
  14. 8800
  15. 23
  16. 9
  17. 1
  18. 16
  19. 9600
  20. 792
  21. 72
  22. 1653
  23. 40
  24. 27
  25. 43000
  26. 1
  27. 741
  28. 256
  29. 9
  30. 7
  31. 68
  32. 18
  33. 63
  34. 63
  35. 6
  36. 29
  37. 1111
  38. 3
  39. 49
  40. 6260

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