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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 76 · 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.What comes next? 20, 22, 24, 26, ? (a) 30 (b) 26 (c) 28 (d) 29
  2. 2.A piggy bank has 8 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  3. 3.I thought of a number, multiplied it by 5 and added 4. I got 64. What was my number?
  4. 4.In 4 years a boy will be 14 years old. How old was he 4 years ago?
  5. 5.Odd one out: which number is NOT in the 8 times table? (a) 38 (b) 32 (c) 72 (d) 48
  6. 6.9 × 9 =
  7. 7.A piggy bank has 10 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  8. 8.Magic trick! Think of 3. Double it, add 10, halve it, then take away 3. What number do you get?
  9. 9.1 + 3 + 5 + … + 45 =
  10. 10.Magic square (every row, column and diagonal has the same total): 8 13 12 | ? 11 7 | 10 9 14. What is the missing number?
  11. 11.693 + 396 =
  12. 12.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
  13. 13.297 + 792 =
  14. 14.123 × 9 + 4 =
  15. 15.Do the 1089 trick with 994: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.1234567 × 8 + 7 =
  17. 17.51 × 4 =
  18. 18.Take 55 and take away the sum of its digits. What do you get?
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.1234567 × 9 + 8 =
  21. 21.396 + 693 =
  22. 22.1 + 2 + 3 + … + 48 =
  23. 23.9 × 3 = ?7 — what is the missing digit?
  24. 24.Odd one out: which number is NOT in the 9 times table? (a) 52 (b) 54 (c) 45 (d) 36
  25. 25.9 × 5 = 4? — what is the missing digit?
  26. 26.Think of 2. Multiply it by 3, then add 2. What number do you end with?
  27. 27.Double 49 =
  28. 28.What comes next? 6, 12, 18, 24, ? (a) 31 (b) 24 (c) 36 (d) 30
  29. 29.Take 61 and take away the sum of its digits. What do you get?
  30. 30.37 × 9 =
  31. 31.Take 83 and take away the sum of its digits. What do you get?
  32. 32.Half of 114 =
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  34. 34.1 + 2 + 3 + … + 91 =
  35. 35.12 × 8 + 2 =
  36. 36.13 × 4 =
  37. 37.9 × 2 =
  38. 38.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 19 ? | 25 15 17. What is the missing number?
  39. 39.1 × 9 =
  40. 40.Half of 186 =

Answer key

  1. 28
  2. 50
  3. 12
  4. 6
  5. 38
  6. 81
  7. 68
  8. 5
  9. 529
  10. 15
  11. 1089
  12. 1
  13. 1089
  14. 1111
  15. 1089
  16. 9876543
  17. 204
  18. 45
  19. 1
  20. 11111111
  21. 1089
  22. 1176
  23. 2
  24. 52
  25. 5
  26. 8
  27. 98
  28. 30
  29. 54
  30. 333
  31. 72
  32. 57
  33. 792
  34. 4186
  35. 98
  36. 52
  37. 18
  38. 27
  39. 9
  40. 93

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