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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 425 · 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.I thought of a number, added 6 and then doubled it. I got 44. What was my number?
  2. 2.A piggy bank has 3 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  3. 3.12345679 × 18 =
  4. 4.666 × ? = 6660
  5. 5.111 × 111 =
  6. 6.Double 88 =
  7. 7.9 × 9 = ?1 — what is the missing digit?
  8. 8.Take 44 and take away the sum of its digits. What do you get?
  9. 9.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 16 (d) 12
  10. 10.Double 31 =
  11. 11.6 × 9 =
  12. 12.9 × 3 =
  13. 13.9 × 8 =
  14. 14.Double 58 =
  15. 15.If today is Monday, what day was it 9 days ago? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  16. 16.I thought of a number, added 2 and then doubled it. I got 26. What was my number?
  17. 17.Magic trick! Think of 2. Double it, add 18, halve it, then take away 2. What number do you get?
  18. 18.9 × 7 =
  19. 19.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 3 years?
  20. 20.7 × 9 =
  21. 21.11 × 4 =
  22. 22.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 34 (c) 36 (d) 37
  23. 23.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 64 (c) 48 (d) 56
  24. 24.Magic square (every row, column and diagonal has the same total): 7 14 9 | 12 ? 8 | 11 6 13. What is the missing number?
  25. 25.97 × 100 =
  26. 26.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  27. 27.If today is Friday, what day will it be after 85 days? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  28. 28.If today is Friday, what day was it 28 days ago? (a) Saturday (b) Monday (c) Friday (d) Thursday
  29. 29.I thought of a number, added 3 and then doubled it. I got 22. What was my number?
  30. 30.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 10 (c) 20 (d) 41
  31. 31.Magic square (every row, column and diagonal has the same total): 26 11 ? | 29 23 17 | 14 35 20. What is the missing number?
  32. 32.A father is 36 years old and his son is 7. How old was the father when the son was born?
  33. 33.Magic square (every row, column and diagonal has the same total): 21 18 33 | 36 24 ? | 15 30 27. What is the missing number?
  34. 34.1 + 2 + 3 + … + 90 =
  35. 35.59 × 10 =
  36. 36.I thought of a number, multiplied it by 2 and added 6. I got 30. What was my number?
  37. 37.9 × 6 = ?4 — what is the missing digit?
  38. 38.I thought of a number, multiplied it by 2 and added 1. I got 17. What was my number?
  39. 39.Take 73 and take away the sum of its digits. What do you get?
  40. 40.I thought of a number, multiplied it by 2 and added 9. I got 17. What was my number?

Answer key

  1. 16
  2. 33
  3. 222222222
  4. 10
  5. 12321
  6. 176
  7. 8
  8. 36
  9. 16
  10. 62
  11. 54
  12. 27
  13. 72
  14. 116
  15. Saturday
  16. 11
  17. 9
  18. 63
  19. 13
  20. 63
  21. 44
  22. 36
  23. 64
  24. 10
  25. 9700
  26. 891
  27. Saturday
  28. Friday
  29. 8
  30. 41
  31. 32
  32. 29
  33. 12
  34. 4095
  35. 590
  36. 12
  37. 5
  38. 8
  39. 63
  40. 4

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