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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 121 · 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.Odd one out: which number is NOT in the 6 times table? (a) 18 (b) 24 (c) 13 (d) 42
  2. 2.The ages of two twins add up to 14. How old is each twin?
  3. 3.9 × 2 = 1? — what is the missing digit?
  4. 4.Take 11 and take away the sum of its digits. What do you get?
  5. 5.216 × 10 =
  6. 6.1 + 2 + 3 + … + 44 =
  7. 7.What comes next? 20, 22, 24, 26, ? (a) 28 (b) 29 (c) 30 (d) 26
  8. 8.9 × 3 = 2? — what is the missing digit?
  9. 9.33 × 100 =
  10. 10.9 × 7 = ?3 — what is the missing digit?
  11. 11.I thought of a number, added 8 and then doubled it. I got 30. What was my number?
  12. 12.Magic square (every row, column and diagonal has the same total): 17 7 9 | 3 11 ? | 13 15 5. What is the missing number?
  13. 13.42 × 100 =
  14. 14.The 8th of a month is a Sunday. What day is the 20th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  15. 15.The ages of two twins add up to 16. How old is each twin?
  16. 16.26 × 4 =
  17. 17.2 × 9 =
  18. 18.14 × 1000 =
  19. 19.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 60 (d) 70
  20. 20.20 × 4 =
  21. 21.9 × 8 = ?2 — what is the missing digit?
  22. 22.The 8th of a month is a Thursday. What day is the 16th of the same month? (a) Saturday (b) Thursday (c) Monday (d) Friday
  23. 23.What comes next? 4, 6, 8, 10, ? (a) 10 (b) 12 (c) 13 (d) 14
  24. 24.354 × 10 =
  25. 25.12345 × 8 + 5 =
  26. 26.Magic square (every row, column and diagonal has the same total): 2 9 4 | 7 5 3 | ? 1 8. What is the missing number?
  27. 27.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 25 (c) 26 (d) 23
  28. 28.Half of 16 =
  29. 29.1234 × 8 + 4 =
  30. 30.Take 288. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.62?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Do the 1089 trick with 750: reverse and subtract, then reverse that answer and add. What do you get?
  33. 33.Double 39 =
  34. 34.200 × ? = 2000
  35. 35.19 × 4 =
  36. 36.12345679 × 81 =
  37. 37.1 + 2 + 3 + … + 56 =
  38. 38.31 × 4 =
  39. 39.The ages of two twins add up to 28. How old is each twin?
  40. 40.Think of 13. Multiply it by 4, then add 8. What number do you end with?

Answer key

  1. 13
  2. 7
  3. 8
  4. 9
  5. 2160
  6. 990
  7. 28
  8. 7
  9. 3300
  10. 6
  11. 7
  12. 19
  13. 4200
  14. Friday
  15. 8
  16. 104
  17. 18
  18. 14000
  19. 80
  20. 80
  21. 7
  22. Friday
  23. 12
  24. 3540
  25. 98765
  26. 6
  27. 25
  28. 8
  29. 9876
  30. 594
  31. 7
  32. 1089
  33. 78
  34. 10
  35. 76
  36. 999999999
  37. 1596
  38. 124
  39. 14
  40. 60

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