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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 203 · 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. 1.457 × 10 =
  2. 2.1 + 2 + 3 + … + 32 =
  3. 3.A piggy bank has 12 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  4. 4.37 × 4 =
  5. 5.9 × 7 = 6? — what is the missing digit?
  6. 6.7 × 9 =
  7. 7.1 + 3 + 5 + … + 39 =
  8. 8.1234567 × 9 + 8 =
  9. 9.14 × 100 =
  10. 10.9 × 8 = 7? — what is the missing digit?
  11. 11.693 + 396 =
  12. 12.Double 73 =
  13. 13.If today is Friday, what day was it 48 days ago? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  14. 14.10 × 9 =
  15. 15.1 + 3 + 5 + … + 17 =
  16. 16.9 × 9 =
  17. 17.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
  18. 18.42 × 4 =
  19. 19.Magic square (every row, column and diagonal has the same total): 10 8 18 | 20 ? 4 | 6 16 14. What is the missing number?
  20. 20.1 + 3 + 5 + … + 15 =
  21. 21.If today is Wednesday, what day was it 14 days ago? (a) Wednesday (b) Thursday (c) Tuesday (d) Saturday
  22. 22.In 3 years a boy will be 16 years old. How old was he 4 years ago?
  23. 23.27 × 4 =
  24. 24.I thought of a number, multiplied it by 2 and added 3. I got 19. What was my number?
  25. 25.50?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.34 × 4 =
  27. 27.18 × 4 =
  28. 28.Magic square (every row, column and diagonal has the same total): 13 ? 7 | 10 16 22 | 25 4 19. What is the missing number?
  29. 29.Half of 82 =
  30. 30.15 × 100 =
  31. 31.9 × 4 = ?6 — what is the missing digit?
  32. 32.9 × 6 =
  33. 33.Take 84 and take away the sum of its digits. What do you get?
  34. 34.Double 69 =
  35. 35.Magic square (every row, column and diagonal has the same total): 4 9 8 | ? 7 3 | 6 5 10. What is the missing number?
  36. 36.1111 × 1111 =
  37. 37.Think of 7. Multiply it by 2, then add 7. What number do you end with?
  38. 38.1 + 3 + 5 + … + 37 =
  39. 39.9 × 6 = 5? — what is the missing digit?
  40. 40.9 × 1 =

Answer key

  1. 4570
  2. 528
  3. 88
  4. 148
  5. 3
  6. 63
  7. 400
  8. 11111111
  9. 1400
  10. 2
  11. 1089
  12. 146
  13. Saturday
  14. 90
  15. 81
  16. 81
  17. 3
  18. 168
  19. 12
  20. 64
  21. Wednesday
  22. 9
  23. 108
  24. 8
  25. 3
  26. 136
  27. 72
  28. 28
  29. 41
  30. 1500
  31. 3
  32. 54
  33. 72
  34. 138
  35. 11
  36. 1234321
  37. 21
  38. 361
  39. 4
  40. 9

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