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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 282 · 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.Take 13 and take away the sum of its digits. What do you get?
  2. 2.260 × 10 =
  3. 3.9 × 8 = 7? — what is the missing digit?
  4. 4.1 + 2 + 3 + … + 56 =
  5. 5.47 × 10 =
  6. 6.Double 41 =
  7. 7.22 × 100 =
  8. 8.54 × 4 =
  9. 9.Double 36 =
  10. 10.If today is Saturday, what day will it be after 21 days? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  11. 11.In 3 years a boy will be 13 years old. How old was he 4 years ago?
  12. 12.14 × 100 =
  13. 13.9 × 3 = ?7 — what is the missing digit?
  14. 14.Half of 48 =
  15. 15.123456 × 8 + 6 =
  16. 16.Double 28 =
  17. 17.3?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.?209 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 10 =
  20. 20.44 × 4 =
  21. 21.1 + 3 + 5 + … + 13 =
  22. 22.32 × 4 =
  23. 23.Magic trick! Think of 4. Double it, add 16, halve it, then take away 4. What number do you get?
  24. 24.9 × 6 = ?4 — what is the missing digit?
  25. 25.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 32 (c) 33 (d) 28
  26. 26.1 + 3 + 5 + … + 43 =
  27. 27.I thought of a number, added 1 and then doubled it. I got 8. What was my number?
  28. 28.A piggy bank has 10 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  29. 29.9 × 5 = 4? — what is the missing digit?
  30. 30.35?1 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, multiplied it by 3 and added 8. I got 53. What was my number?
  32. 32.7 × 9 =
  33. 33.I thought of a number, multiplied it by 4 and added 6. I got 42. What was my number?
  34. 34.1 + 2 + 3 + … + 89 =
  35. 35.Magic square (every row, column and diagonal has the same total): 9 4 5 | 2 ? 10 | 7 8 3. What is the missing number?
  36. 36.1 + 2 + 3 + … + 7 =
  37. 37.347 × ? = 3470
  38. 38.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 3 years?
  39. 39.I thought of a number, multiplied it by 4 and added 7. I got 43. What was my number?
  40. 40.Double 17 =

Answer key

  1. 9
  2. 2600
  3. 2
  4. 1596
  5. 470
  6. 82
  7. 2200
  8. 216
  9. 72
  10. Saturday
  11. 6
  12. 1400
  13. 2
  14. 24
  15. 987654
  16. 56
  17. 7
  18. 7
  19. 90
  20. 176
  21. 49
  22. 128
  23. 8
  24. 5
  25. 32
  26. 484
  27. 3
  28. 80
  29. 5
  30. 9
  31. 15
  32. 63
  33. 9
  34. 4005
  35. 6
  36. 28
  37. 10
  38. 18
  39. 9
  40. 34

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