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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 570 · 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. 1.39 × 4 =
  2. 2.Take 46 and take away the sum of its digits. What do you get?
  3. 3.9 × 5 =
  4. 4.If today is Monday, what day was it 36 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  5. 5.Take 52 and take away the sum of its digits. What do you get?
  6. 6.693 + 396 =
  7. 7.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 51 (c) 47 (d) 49
  8. 8.7?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.1 + 2 + 3 + … + 6 =
  10. 10.Magic trick! Think of 11. Double it, add 12, halve it, then take away 11. What number do you get?
  11. 11.The 3rd of a month is a Thursday. What day is the 22nd of the same month? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  13. 13.1234 × 8 + 4 =
  14. 14.9 × 4 = ?6 — what is the missing digit?
  15. 15.56 × 4 =
  16. 16.198 + 891 =
  17. 17.The ages of two twins add up to 14. How old is each twin?
  18. 18.Half of 52 =
  19. 19.Take 67 and take away the sum of its digits. What do you get?
  20. 20.17 × 4 =
  21. 21.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 64 (c) 65 (d) 66
  22. 22.9 × 7 = ?3 — what is the missing digit?
  23. 23.22 × 4 =
  24. 24.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 16 (d) 12
  25. 25.12345679 × 27 =
  26. 26.9 × 9 = ?1 — what is the missing digit?
  27. 27.Take 16 and take away the sum of its digits. What do you get?
  28. 28.27 × 1000 =
  29. 29.The ages of two twins add up to 24. How old is each twin?
  30. 30.1?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.I thought of a number, added 4 and then doubled it. I got 18. What was my number?
  32. 32.The 7th of a month is a Monday. What day is the 17th of the same month? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  33. 33.?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Do the 1089 trick with 794: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.Half of 48 =
  37. 37.Half of 22 =
  38. 38.Odd one out: which number is NOT in the 3 times table? (a) 28 (b) 18 (c) 15 (d) 9
  39. 39.9 × 9 =
  40. 40.I thought of a number, multiplied it by 2 and added 1. I got 29. What was my number?

Answer key

  1. 156
  2. 36
  3. 45
  4. Sunday
  5. 45
  6. 1089
  7. 49
  8. 1
  9. 21
  10. 6
  11. Tuesday
  12. 693
  13. 9876
  14. 3
  15. 224
  16. 1089
  17. 7
  18. 26
  19. 54
  20. 68
  21. 64
  22. 6
  23. 88
  24. 16
  25. 333333333
  26. 8
  27. 9
  28. 27000
  29. 12
  30. 9
  31. 5
  32. Thursday
  33. 2
  34. 1089
  35. 2
  36. 24
  37. 11
  38. 28
  39. 81
  40. 14

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