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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 544 · 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.Double 41 =
  2. 2.9 × 6 = ?4 — what is the missing digit?
  3. 3.14?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.32 × 4 =
  5. 5.27 × 4 =
  6. 6.Half of 194 =
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  8. 8.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 7 | 13 3 ?. What is the missing number?
  9. 9.The ages of two twins add up to 22. How old is each twin?
  10. 10.Half of 82 =
  11. 11.What comes next? 3, 7, 11, 15, ? (a) 20 (b) 19 (c) 23 (d) 15
  12. 12.12 × 8 + 2 =
  13. 13.?570 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.37 × 21 =
  15. 15.9 × 8 =
  16. 16.Double 87 =
  17. 17.Double 57 =
  18. 18.4 × 9 =
  19. 19.28 × 4 =
  20. 20.In 2 years a boy will be 11 years old. How old was he 3 years ago?
  21. 21.?638 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.Half of 14 =
  23. 23.3 × 9 =
  24. 24.1 + 2 + 3 + … + 50 =
  25. 25.Magic trick! Think of 8. Double it, add 14, halve it, then take away 8. What number do you get?
  26. 26.31 × 4 =
  27. 27.68 × 100 =
  28. 28.1 + 3 + 5 + … + 11 =
  29. 29.56?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.9 × 5 = 4? — what is the missing digit?
  31. 31.Take 93 and take away the sum of its digits. What do you get?
  32. 32.2 × 9 =
  33. 33.9 × 3 =
  34. 34.Half of 164 =
  35. 35.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
  36. 36.What comes next? 7, 12, 17, 22, ? (a) 28 (b) 22 (c) 32 (d) 27
  37. 37.The 8th of a month is a Tuesday. What day is the 30th of the same month? (a) Thursday (b) Wednesday (c) Tuesday (d) Saturday
  38. 38.9 × 3 = 2? — what is the missing digit?
  39. 39.Double 17 =
  40. 40.Magic square (every row, column and diagonal has the same total): ? 8 7 | 10 6 2 | 5 4 9. What is the missing number?

Answer key

  1. 82
  2. 5
  3. 3
  4. 128
  5. 108
  6. 97
  7. 594
  8. 17
  9. 11
  10. 41
  11. 19
  12. 98
  13. 6
  14. 777
  15. 72
  16. 174
  17. 114
  18. 36
  19. 112
  20. 6
  21. 1
  22. 7
  23. 27
  24. 1275
  25. 7
  26. 124
  27. 6800
  28. 36
  29. 7
  30. 5
  31. 81
  32. 18
  33. 27
  34. 82
  35. 5
  36. 27
  37. Wednesday
  38. 7
  39. 34
  40. 3

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