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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 571 · 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. 1.297 + 792 =
  2. 2.Half of 46 =
  3. 3.Double 25 =
  4. 4.9 × 8 = ?2 — what is the missing digit?
  5. 5.In 5 years a boy will be 14 years old. How old was he 7 years ago?
  6. 6.123 × 8 + 3 =
  7. 7.If today is Monday, what day will it be after 42 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
  8. 8.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  9. 9.37 × 6 =
  10. 10.1234567 × 9 + 8 =
  11. 11.I thought of a number, added 1 and then doubled it. I got 18. What was my number?
  12. 12.?088 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.9 × 2 = ?8 — what is the missing digit?
  14. 14.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  15. 15.67?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.12345679 × 63 =
  17. 17.Magic trick! Think of 17. Double it, add 8, halve it, then take away 17. What number do you get?
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  19. 19.56 × 4 =
  20. 20.33 × 4 =
  21. 21.9 × 7 = ?3 — what is the missing digit?
  22. 22.2 × 9 =
  23. 23.9 × 5 = ?5 — what is the missing digit?
  24. 24.Magic square (every row, column and diagonal has the same total): 15 25 11 | 13 17 21 | ? 9 19. What is the missing number?
  25. 25.If today is Sunday, what day was it 20 days ago? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
  26. 26.89 × ? = 8900
  27. 27.198 + 891 =
  28. 28.The ages of two twins add up to 18. How old is each twin?
  29. 29.12345679 × 9 =
  30. 30.Half of 146 =
  31. 31.Take 84 and take away the sum of its digits. What do you get?
  32. 32.37 × 18 =
  33. 33.9 × 10 =
  34. 34.9 × 10 = 9? — what is the missing digit?
  35. 35.66?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.833? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.What comes next? 4, 6, 8, 10, ? (a) 12 (b) 13 (c) 14 (d) 10
  38. 38.If today is Wednesday, what day will it be after 40 days? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
  39. 39.12 × 4 =
  40. 40.9 × 9 = 8? — what is the missing digit?

Answer key

  1. 1089
  2. 23
  3. 50
  4. 7
  5. 2
  6. 987
  7. Monday
  8. 5
  9. 222
  10. 11111111
  11. 8
  12. 2
  13. 1
  14. 2
  15. 5
  16. 777777777
  17. 4
  18. 693
  19. 224
  20. 132
  21. 6
  22. 18
  23. 4
  24. 23
  25. Monday
  26. 100
  27. 1089
  28. 9
  29. 111111111
  30. 73
  31. 72
  32. 666
  33. 90
  34. 0
  35. 4
  36. 4
  37. 12
  38. Monday
  39. 48
  40. 1

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