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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 755 · 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 53 =
  2. 2.1 + 2 + 3 + … + 59 =
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.693 + 396 =
  5. 5.4 × 1000 =
  6. 6.1 + 3 + 5 + … + 17 =
  7. 7.9 × 7 = ?3 — what is the missing digit?
  8. 8.Double 89 =
  9. 9.Magic square (every row, column and diagonal has the same total): 24 10 20 | 14 ? 22 | 16 26 12. What is the missing number?
  10. 10.1 + 2 + 3 + … + 81 =
  11. 11.9 × 1 =
  12. 12.Take 26 and take away the sum of its digits. What do you get?
  13. 13.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 10 14 | ? 12 7. What is the missing number?
  14. 14.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 19 13 | 10 ? 16. What is the missing number?
  15. 15.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 36 (c) 10 (d) 20
  16. 16.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 6 years?
  17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  18. 18.Magic square (every row, column and diagonal has the same total): 6 5 10 | 11 7 3 | 4 9 ?. What is the missing number?
  19. 19.9 × 3 = 2? — what is the missing digit?
  20. 20.If today is Sunday, what day will it be after 65 days? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  21. 21.41 × 1000 =
  22. 22.What comes next? 3, 6, 9, 12, ? (a) 15 (b) 12 (c) 16 (d) 18
  23. 23.50 × 4 =
  24. 24.9 × 3 = ?7 — what is the missing digit?
  25. 25.18 × 4 =
  26. 26.594 + 495 =
  27. 27.Magic square (every row, column and diagonal has the same total): 5 ? 9 | 15 11 7 | 13 3 17. What is the missing number?
  28. 28.1 + 2 + 3 + … + 52 =
  29. 29.In 3 years a boy will be 11 years old. How old was he 3 years ago?
  30. 30.Think of 11. Multiply it by 2, then add 5. What number do you end with?
  31. 31.13?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.?208 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 ? 3. What is the missing number?
  34. 34.12345679 × 81 =
  35. 35.129 × ? = 1290
  36. 36.9 × 2 =
  37. 37.?034 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Magic square (every row, column and diagonal has the same total): 17 10 15 | 12 14 16 | ? 18 11. What is the missing number?
  39. 39.Double 55 =
  40. 40.Magic square (every row, column and diagonal has the same total): ? 15 30 | 33 21 9 | 12 27 24. What is the missing number?

Answer key

  1. 106
  2. 1770
  3. 3
  4. 1089
  5. 4000
  6. 81
  7. 6
  8. 178
  9. 18
  10. 3321
  11. 9
  12. 18
  13. 11
  14. 31
  15. 36
  16. 22
  17. 495
  18. 8
  19. 7
  20. Tuesday
  21. 41000
  22. 15
  23. 200
  24. 2
  25. 72
  26. 1089
  27. 19
  28. 1378
  29. 5
  30. 27
  31. 9
  32. 8
  33. 10
  34. 999999999
  35. 10
  36. 18
  37. 2
  38. 13
  39. 110
  40. 18

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