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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 200 · 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. 1.40 × 4 =
  2. 2.1 + 2 + 3 + … + 12 =
  3. 3.Magic square (every row, column and diagonal has the same total): 20 10 ? | 6 14 22 | 16 18 8. What is the missing number?
  4. 4.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  5. 5.9 × 5 = ?5 — what is the missing digit?
  6. 6.Think of 13. Multiply it by 4, then add 8. What number do you end with?
  7. 7.9 × 8 =
  8. 8.Magic square (every row, column and diagonal has the same total): ? 12 7 | 6 10 14 | 13 8 9. What is the missing number?
  9. 9.2 × 9 =
  10. 10.36 × 100 =
  11. 11.Think of 7. Multiply it by 4, then add 2. What number do you end with?
  12. 12.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 54 (c) 72 (d) 78
  13. 13.If today is Sunday, what day will it be after 21 days? (a) Sunday (b) Wednesday (c) Saturday (d) Monday
  14. 14.Do the 1089 trick with 270: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.If today is Sunday, what day will it be after 28 days? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  16. 16.59 × 4 =
  17. 17.33 × 4 =
  18. 18.12 × 9 + 3 =
  19. 19.Double 12 =
  20. 20.1 + 3 + 5 + … + 47 =
  21. 21.9 × 7 = ?3 — what is the missing digit?
  22. 22.Half of 104 =
  23. 23.98 × ? = 9800
  24. 24.Magic trick! Think of 12. Double it, add 10, halve it, then take away 12. What number do you get?
  25. 25.9 × 6 =
  26. 26.37 × 18 =
  27. 27.Odd one out: which number is NOT in the 6 times table? (a) 24 (b) 36 (c) 48 (d) 14
  28. 28.9 × 7 = 6? — what is the missing digit?
  29. 29.If today is Sunday, what day was it 48 days ago? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
  30. 30.20 × 4 =
  31. 31.1 + 2 + 3 + … + 58 =
  32. 32.Magic square (every row, column and diagonal has the same total): 12 9 ? | 27 15 3 | 6 21 18. What is the missing number?
  33. 33.Magic trick! Think of 10. Double it, add 4, halve it, then take away 10. What number do you get?
  34. 34.If today is Tuesday, what day will it be after 98 days? (a) Monday (b) Wednesday (c) Tuesday (d) Friday
  35. 35.1 + 3 + 5 + … + 17 =
  36. 36.9 × 4 = 3? — what is the missing digit?
  37. 37.10 × 4 =
  38. 38.43 × 100 =
  39. 39.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 18 (c) 68 (d) 36
  40. 40.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 12 (c) 28 (d) 14

Answer key

  1. 160
  2. 78
  3. 12
  4. 29
  5. 4
  6. 60
  7. 72
  8. 11
  9. 18
  10. 3600
  11. 30
  12. 78
  13. Sunday
  14. 1089
  15. Sunday
  16. 236
  17. 132
  18. 111
  19. 24
  20. 576
  21. 6
  22. 52
  23. 100
  24. 5
  25. 54
  26. 666
  27. 14
  28. 3
  29. Monday
  30. 80
  31. 1711
  32. 24
  33. 2
  34. Tuesday
  35. 81
  36. 6
  37. 40
  38. 4300
  39. 68
  40. 14

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