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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 155 · 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.The ages of two twins add up to 8. How old is each twin?
  2. 2.Take 651. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.Magic square (every row, column and diagonal has the same total): 19 34 13 | 16 22 28 | 31 10 ?. What is the missing number?
  4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  5. 5.A piggy bank has 3 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  6. 6.9 × 7 = 6? — what is the missing digit?
  7. 7.9 × 7 =
  8. 8.9 × 2 = ?8 — what is the missing digit?
  9. 9.1 + 2 + 3 + … + 83 =
  10. 10.37 × 3 =
  11. 11.1 + 2 + 3 + … + 60 =
  12. 12.1 + 2 + 3 + … + 86 =
  13. 13.59 × 4 =
  14. 14.1111 × 1111 =
  15. 15.9 × 8 = 7? — what is the missing digit?
  16. 16.Odd one out: which number is NOT in the 4 times table? (a) 8 (b) 20 (c) 24 (d) 14
  17. 17.What comes next? 10, 15, 20, 25, ? (a) 25 (b) 35 (c) 31 (d) 30
  18. 18.3 × 9 =
  19. 19.Half of 168 =
  20. 20.Half of 116 =
  21. 21.Take 96 and take away the sum of its digits. What do you get?
  22. 22.Take 329. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.The 9th of a month is a Friday. What day is the 25th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  24. 24.The ages of two twins add up to 10. How old is each twin?
  25. 25.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 8 years?
  26. 26.Half of 16 =
  27. 27.Magic trick! Think of 14. Double it, add 8, halve it, then take away 14. What number do you get?
  28. 28.9 × 10 = ?0 — what is the missing digit?
  29. 29.594 + 495 =
  30. 30.Magic square (every row, column and diagonal has the same total): 19 21 11 | 9 17 ? | 23 13 15. What is the missing number?
  31. 31.9 × 5 = ?5 — what is the missing digit?
  32. 32.Think of 7. Multiply it by 4, then add 9. What number do you end with?
  33. 33.9 × 4 = ?6 — what is the missing digit?
  34. 34.48?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.If today is Friday, what day will it be after 81 days? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  36. 36.84 × 100 =
  37. 37.693 + 396 =
  38. 38.A father is 31 years old and his son is 8. How old was the father when the son was born?
  39. 39.48 × 4 =
  40. 40.Double 17 =

Answer key

  1. 4
  2. 495
  3. 25
  4. 792
  5. 35
  6. 3
  7. 63
  8. 1
  9. 3486
  10. 111
  11. 1830
  12. 3741
  13. 236
  14. 1234321
  15. 2
  16. 14
  17. 30
  18. 27
  19. 84
  20. 58
  21. 81
  22. 594
  23. Sunday
  24. 5
  25. 18
  26. 8
  27. 4
  28. 9
  29. 1089
  30. 25
  31. 4
  32. 37
  33. 3
  34. 3
  35. Tuesday
  36. 8400
  37. 1089
  38. 23
  39. 192
  40. 34

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