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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 465 · 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.Do the 1089 trick with 568: reverse and subtract, then reverse that answer and add. What do you get?
  2. 2.14 × 4 =
  3. 3.55 × 4 =
  4. 4.In 6 years a boy will be 19 years old. How old was he 6 years ago?
  5. 5.A piggy bank has 6 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  6. 6.Take 64 and take away the sum of its digits. What do you get?
  7. 7.12 × 1000 =
  8. 8.Double 15 =
  9. 9.Magic square (every row, column and diagonal has the same total): 17 10 15 | 12 14 ? | 13 18 11. What is the missing number?
  10. 10.If today is Tuesday, what day was it 16 days ago? (a) Sunday (b) Monday (c) Saturday (d) Wednesday
  11. 11.792 + 297 =
  12. 12.1 × 9 =
  13. 13.9 × 2 =
  14. 14.Take 55 and take away the sum of its digits. What do you get?
  15. 15.?020 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.59?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.The 7th of a month is a Saturday. What day is the 17th of the same month? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
  18. 18.30 × 100 =
  19. 19.9 × 8 = ?2 — what is the missing digit?
  20. 20.1 + 2 + 3 + … + 46 =
  21. 21.Think of 7. Multiply it by 5, then add 8. What number do you end with?
  22. 22.If today is Sunday, what day was it 38 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  23. 23.What comes next? 1, 4, 7, 10, ? (a) 13 (b) 14 (c) 16 (d) 10
  24. 24.37 × 4 =
  25. 25.Take 50 and take away the sum of its digits. What do you get?
  26. 26.594 + 495 =
  27. 27.12345 × 9 + 6 =
  28. 28.9 × 8 = 7? — what is the missing digit?
  29. 29.45 × 4 =
  30. 30.9 × 3 = 2? — what is the missing digit?
  31. 31.37 × 1000 =
  32. 32.A father is 31 years old and his son is 12. How old was the father when the son was born?
  33. 33.21?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.12345 × 8 + 5 =
  35. 35.3 × 9 =
  36. 36.What comes next? 6, 9, 12, 15, ? (a) 21 (b) 18 (c) 19 (d) 15
  37. 37.59 × 4 =
  38. 38.The ages of two twins add up to 8. How old is each twin?
  39. 39.9 × 7 = 6? — what is the missing digit?
  40. 40.I thought of a number, multiplied it by 4 and added 7. I got 63. What was my number?

Answer key

  1. 1089
  2. 56
  3. 220
  4. 7
  5. 42
  6. 54
  7. 12000
  8. 30
  9. 16
  10. Sunday
  11. 1089
  12. 9
  13. 18
  14. 45
  15. 7
  16. 4
  17. Tuesday
  18. 3000
  19. 7
  20. 1081
  21. 43
  22. Thursday
  23. 13
  24. 148
  25. 45
  26. 1089
  27. 111111
  28. 2
  29. 180
  30. 7
  31. 37000
  32. 19
  33. 1
  34. 98765
  35. 27
  36. 18
  37. 236
  38. 4
  39. 3
  40. 14

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