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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 364 · 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.A girl is 7 years old and her brother is 4 years older. How old will her brother be in 9 years?
  2. 2.Magic square (every row, column and diagonal has the same total): 20 ? 12 | 6 14 22 | 16 18 8. What is the missing number?
  3. 3.The 5th of a month is a Sunday. What day is the 21st of the same month? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
  4. 4.?133 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Magic square (every row, column and diagonal has the same total): ? 6 27 | 24 18 12 | 9 30 15. What is the missing number?
  6. 6.Double 14 =
  7. 7.I thought of a number, multiplied it by 5 and added 8. I got 83. What was my number?
  8. 8.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 62 (d) 65
  9. 9.2 × 9 =
  10. 10.Do the 1089 trick with 209: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  12. 12.Take 24 and take away the sum of its digits. What do you get?
  13. 13.3?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.78 × ? = 7800
  15. 15.27 × 100 =
  16. 16.The ages of two twins add up to 24. How old is each twin?
  17. 17.8 × 1000 =
  18. 18.Half of 62 =
  19. 19.Take 917. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.1 + 3 + 5 + … + 19 =
  21. 21.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 16 (d) 12
  22. 22.9 × 10 =
  23. 23.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 ? 16 | 10 20 6. What is the missing number?
  24. 24.9 × 3 = ?7 — what is the missing digit?
  25. 25.1 + 3 + 5 + … + 29 =
  26. 26.The 5th of a month is a Sunday. What day is the 27th of the same month? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  27. 27.12 × 4 =
  28. 28.What comes next? 17, 22, 27, 32, ? (a) 42 (b) 38 (c) 37 (d) 32
  29. 29.1 + 2 + 3 + … + 23 =
  30. 30.9 × 4 = ?6 — what is the missing digit?
  31. 31.9 × 8 = 7? — what is the missing digit?
  32. 32.Magic trick! Think of 18. Double it, add 8, halve it, then take away 18. What number do you get?
  33. 33.I thought of a number, multiplied it by 2 and added 3. I got 25. What was my number?
  34. 34.37 × 24 =
  35. 35.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 98 (d) 102
  36. 36.4 × 9 =
  37. 37.891 + 198 =
  38. 38.1 + 2 + 3 + … + 55 =
  39. 39.9 × 7 =
  40. 40.9 × 9 = ?1 — what is the missing digit?

Answer key

  1. 20
  2. 10
  3. Tuesday
  4. 2
  5. 21
  6. 28
  7. 15
  8. 64
  9. 18
  10. 1089
  11. 297
  12. 18
  13. 1
  14. 100
  15. 2700
  16. 12
  17. 8000
  18. 31
  19. 198
  20. 100
  21. 16
  22. 90
  23. 12
  24. 2
  25. 225
  26. Monday
  27. 48
  28. 37
  29. 276
  30. 3
  31. 2
  32. 4
  33. 11
  34. 888
  35. 100
  36. 36
  37. 1089
  38. 1540
  39. 63
  40. 8

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