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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 153 · 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 trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  2. 2.275? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.5 × 1000 =
  4. 4.1 + 3 + 5 + … + 15 =
  5. 5.Magic square (every row, column and diagonal has the same total): 16 18 8 | 6 ? 22 | 20 10 12. What is the missing number?
  6. 6.9 × 7 = ?3 — what is the missing digit?
  7. 7.Take 28 and take away the sum of its digits. What do you get?
  8. 8.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 34 (c) 36 (d) 24
  9. 9.9 × 3 = 2? — what is the missing digit?
  10. 10.52 × 4 =
  11. 11.?99 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.The 5th of a month is a Sunday. What day is the 15th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  13. 13.?654 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  15. 15.Double 85 =
  16. 16.9 × 4 =
  17. 17.9 × 4 = ?6 — what is the missing digit?
  18. 18.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Magic trick! Think of 12. Double it, add 10, halve it, then take away 12. What number do you get?
  21. 21.4 × 9 =
  22. 22.Magic square (every row, column and diagonal has the same total): ? 30 27 | 36 24 12 | 21 18 33. What is the missing number?
  23. 23.Half of 126 =
  24. 24.9 × 4 = 3? — what is the missing digit?
  25. 25.The ages of two twins add up to 18. How old is each twin?
  26. 26.Magic square (every row, column and diagonal has the same total): 26 5 20 | 11 17 23 | 14 ? 8. What is the missing number?
  27. 27.?591 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 62 (d) 64
  29. 29.65 × 100 =
  30. 30.Magic square (every row, column and diagonal has the same total): 10 8 18 | 20 ? 4 | 6 16 14. What is the missing number?
  31. 31.I thought of a number, multiplied it by 3 and added 7. I got 46. What was my number?
  32. 32.Think of 13. Multiply it by 5, then add 5. What number do you end with?
  33. 33.1 + 2 + 3 + … + 58 =
  34. 34.9 × 10 = 9? — what is the missing digit?
  35. 35.111 × 111 =
  36. 36.Double 28 =
  37. 37.143? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.12345679 × 54 =
  39. 39.Magic square (every row, column and diagonal has the same total): 6 21 18 | 27 ? 3 | 12 9 24. What is the missing number?
  40. 40.3?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 2
  2. 4
  3. 5000
  4. 64
  5. 14
  6. 6
  7. 18
  8. 34
  9. 7
  10. 208
  11. 9
  12. Wednesday
  13. 3
  14. 693
  15. 170
  16. 36
  17. 3
  18. 891
  19. 3
  20. 5
  21. 36
  22. 15
  23. 63
  24. 6
  25. 9
  26. 29
  27. 3
  28. 64
  29. 6500
  30. 12
  31. 13
  32. 70
  33. 1711
  34. 0
  35. 12321
  36. 56
  37. 1
  38. 666666666
  39. 15
  40. 7

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