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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 345 · 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. 1.37 × 3 =
  2. 2.5 × 9 =
  3. 3.I thought of a number, multiplied it by 5 and added 4. I got 39. What was my number?
  4. 4.I thought of a number, multiplied it by 4 and added 2. I got 38. What was my number?
  5. 5.610 × ? = 6100
  6. 6.Half of 122 =
  7. 7.160 × ? = 1600
  8. 8.Odd one out: which number is NOT in the 8 times table? (a) 16 (b) 40 (c) 64 (d) 74
  9. 9.What comes next? 1, 3, 5, 7, ? (a) 11 (b) 10 (c) 9 (d) 7
  10. 10.Double 21 =
  11. 11.9 × 10 = ?0 — what is the missing digit?
  12. 12.22 × 4 =
  13. 13.11 × 11 =
  14. 14.3 × 9 =
  15. 15.9 × 10 =
  16. 16.33 × 4 =
  17. 17.1234 × 9 + 5 =
  18. 18.37 × 6 =
  19. 19.Take 69 and take away the sum of its digits. What do you get?
  20. 20.Double 86 =
  21. 21.A piggy bank has 6 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  22. 22.A piggy bank has 8 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  23. 23.I thought of a number, added 2 and then doubled it. I got 26. What was my number?
  24. 24.Magic square (every row, column and diagonal has the same total): ? 17 32 | 35 23 11 | 14 29 26. What is the missing number?
  25. 25.The ages of two twins add up to 24. How old is each twin?
  26. 26.I thought of a number, multiplied it by 4 and added 3. I got 59. What was my number?
  27. 27.In 3 years a boy will be 14 years old. How old was he 6 years ago?
  28. 28.Magic square (every row, column and diagonal has the same total): 25 10 31 | 28 22 16 | 13 ? 19. What is the missing number?
  29. 29.9 × 7 = 6? — what is the missing digit?
  30. 30.29 × 100 =
  31. 31.6 × 9 =
  32. 32.Magic square (every row, column and diagonal has the same total): 16 18 8 | 6 14 ? | 20 10 12. What is the missing number?
  33. 33.9 × 8 =
  34. 34.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 38 (d) 34
  35. 35.2 × 9 =
  36. 36.38 × 4 =
  37. 37.8 × 4 =
  38. 38.A piggy bank has 12 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  39. 39.Take 15 and take away the sum of its digits. What do you get?
  40. 40.9 × 5 = ?5 — what is the missing digit?

Answer key

  1. 111
  2. 45
  3. 7
  4. 9
  5. 10
  6. 61
  7. 10
  8. 74
  9. 9
  10. 42
  11. 9
  12. 88
  13. 121
  14. 27
  15. 90
  16. 132
  17. 11111
  18. 222
  19. 54
  20. 172
  21. 50
  22. 62
  23. 11
  24. 20
  25. 12
  26. 14
  27. 5
  28. 34
  29. 3
  30. 2900
  31. 54
  32. 22
  33. 72
  34. 36
  35. 18
  36. 152
  37. 32
  38. 74
  39. 9
  40. 4

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