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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 141 · 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.Magic square (every row, column and diagonal has the same total): 9 ? 5 | 2 6 10 | 7 8 3. What is the missing number?
  2. 2.547? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.1 + 2 + 3 + … + 58 =
  4. 4.I thought of a number, multiplied it by 4 and added 8. I got 36. What was my number?
  5. 5.Think of 15. Multiply it by 2, then add 9. What number do you end with?
  6. 6.37 × 6 =
  7. 7.Magic trick! Think of 9. Double it, add 14, halve it, then take away 9. What number do you get?
  8. 8.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 9 (c) 19 (d) 21
  9. 9.96 × 100 =
  10. 10.123456 × 9 + 7 =
  11. 11.If today is Tuesday, what day will it be after 81 days? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
  12. 12.Magic square (every row, column and diagonal has the same total): 11 ? 15 | 18 14 10 | 13 12 17. What is the missing number?
  13. 13.1 + 2 + 3 + … + 17 =
  14. 14.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 34 (c) 16 (d) 24
  15. 15.2?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.550 × ? = 5500
  17. 17.9 × 10 = ?0 — what is the missing digit?
  18. 18.93 × 100 =
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  20. 20.Magic square (every row, column and diagonal has the same total): 10 5 ? | 3 7 11 | 8 9 4. What is the missing number?
  21. 21.Magic square (every row, column and diagonal has the same total): 13 11 21 | 23 15 7 | 9 19 ?. What is the missing number?
  22. 22.Odd one out: which number is NOT in the 8 times table? (a) 32 (b) 27 (c) 40 (d) 48
  23. 23.15 × 1000 =
  24. 24.If today is Tuesday, what day will it be after 14 days? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
  25. 25.12345679 × 63 =
  26. 26.9 × 2 = 1? — what is the missing digit?
  27. 27.9 × 2 = ?8 — what is the missing digit?
  28. 28.Half of 32 =
  29. 29.21 × 100 =
  30. 30.Take 32 and take away the sum of its digits. What do you get?
  31. 31.413? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.9 × 6 = ?4 — what is the missing digit?
  33. 33.Do the 1089 trick with 511: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.123 × 9 + 4 =
  35. 35.12345 × 9 + 6 =
  36. 36.Double 36 =
  37. 37.18 × 4 =
  38. 38.47 × 1000 =
  39. 39.33 × 4 =
  40. 40.In 6 years a boy will be 19 years old. How old was he 2 years ago?

Answer key

  1. 4
  2. 2
  3. 1711
  4. 7
  5. 39
  6. 222
  7. 7
  8. 19
  9. 9600
  10. 1111111
  11. Saturday
  12. 16
  13. 153
  14. 34
  15. 4
  16. 10
  17. 9
  18. 9300
  19. 594
  20. 6
  21. 17
  22. 27
  23. 15000
  24. Tuesday
  25. 777777777
  26. 8
  27. 1
  28. 16
  29. 2100
  30. 27
  31. 1
  32. 5
  33. 1089
  34. 1111
  35. 111111
  36. 72
  37. 72
  38. 47000
  39. 132
  40. 11

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