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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 420 · 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. 1.48 × ? = 48000
  2. 2.Magic square (every row, column and diagonal has the same total): 21 ? 17 | 11 15 19 | 13 23 9. What is the missing number?
  3. 3.1 + 2 + 3 + … + 96 =
  4. 4.A father is 39 years old and his son is 9. How old was the father when the son was born?
  5. 5.9 × 3 = 2? — what is the missing digit?
  6. 6.1 + 2 + 3 + … + 15 =
  7. 7.9 × 7 = ?3 — what is the missing digit?
  8. 8.Half of 196 =
  9. 9.If today is Sunday, what day was it 40 days ago? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
  10. 10.A piggy bank has 10 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  11. 11.I thought of a number, added 5 and then doubled it. I got 24. What was my number?
  12. 12.9 × 6 = ?4 — what is the missing digit?
  13. 13.Magic square (every row, column and diagonal has the same total): 11 ? 19 | 25 17 9 | 15 13 23. What is the missing number?
  14. 14.Magic square (every row, column and diagonal has the same total): 6 7 2 | 1 5 9 | 8 3 ?. What is the missing number?
  15. 15.9 × 3 = ?7 — what is the missing digit?
  16. 16.9 × 4 = ?6 — what is the missing digit?
  17. 17.9 × 4 =
  18. 18.9 × 6 = 5? — what is the missing digit?
  19. 19.58 × 4 =
  20. 20.2 × 9 =
  21. 21.18 × 4 =
  22. 22.55 × 4 =
  23. 23.I thought of a number, multiplied it by 5 and added 9. I got 24. What was my number?
  24. 24.Take 860. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.1 + 2 + 3 + … + 31 =
  26. 26.Magic square (every row, column and diagonal has the same total): 9 19 ? | 23 15 7 | 13 11 21. What is the missing number?
  27. 27.Magic trick! Think of 2. Double it, add 16, halve it, then take away 2. What number do you get?
  28. 28.In 2 years a boy will be 10 years old. How old was he 2 years ago?
  29. 29.Half of 92 =
  30. 30.1111 × 1111 =
  31. 31.Magic square (every row, column and diagonal has the same total): ? 10 15 | 12 14 16 | 13 18 11. What is the missing number?
  32. 32.49 × 100 =
  33. 33.173 × 10 =
  34. 34.Half of 96 =
  35. 35.9 × 5 = ?5 — what is the missing digit?
  36. 36.Take 802. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  38. 38.A father is 38 years old and his son is 8. How old was the father when the son was born?
  39. 39.47 × ? = 4700
  40. 40.37 × 9 =

Answer key

  1. 1000
  2. 7
  3. 4656
  4. 30
  5. 7
  6. 120
  7. 6
  8. 98
  9. Tuesday
  10. 80
  11. 7
  12. 5
  13. 21
  14. 4
  15. 2
  16. 3
  17. 36
  18. 4
  19. 232
  20. 18
  21. 72
  22. 220
  23. 3
  24. 792
  25. 496
  26. 17
  27. 8
  28. 6
  29. 46
  30. 1234321
  31. 17
  32. 4900
  33. 1730
  34. 48
  35. 4
  36. 594
  37. 3
  38. 30
  39. 100
  40. 333

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