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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 33 · 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. 1.9 × 10 =
  2. 2.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 19 ? | 22 7 28. What is the missing number?
  3. 3.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 7 years?
  4. 4.891 + 198 =
  5. 5.What comes next? 13, 18, 23, 28, ? (a) 38 (b) 33 (c) 28 (d) 34
  6. 6.1 + 2 + 3 + … + 76 =
  7. 7.11 × 1000 =
  8. 8.A piggy bank has 2 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  9. 9.1 + 2 + 3 + … + 23 =
  10. 10.9 × 6 = ?4 — what is the missing digit?
  11. 11.9 × 7 =
  12. 12.Magic square (every row, column and diagonal has the same total): 20 22 12 | 10 18 ? | 24 14 16. What is the missing number?
  13. 13.21 × 4 =
  14. 14.Half of 16 =
  15. 15.Take 92 and take away the sum of its digits. What do you get?
  16. 16.Think of 10. Multiply it by 4, then add 7. What number do you end with?
  17. 17.88? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.32 × 4 =
  19. 19.26 × 4 =
  20. 20.1234 × 9 + 5 =
  21. 21.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.If today is Friday, what day will it be after 22 days? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  23. 23.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 82 (d) 81
  24. 24.9 × 5 = ?5 — what is the missing digit?
  25. 25.495 + 594 =
  26. 26.Half of 82 =
  27. 27.13 × 1000 =
  28. 28.748 × 10 =
  29. 29.If today is Thursday, what day was it 19 days ago? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  30. 30.The 7th of a month is a Thursday. What day is the 22nd of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
  31. 31.9 × 3 = ?7 — what is the missing digit?
  32. 32.10 × 9 =
  33. 33.6?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 9 years?
  35. 35.The 3rd of a month is a Wednesday. What day is the 25th of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  36. 36.12345678 × 8 + 8 =
  37. 37.4 × 9 =
  38. 38.Magic square (every row, column and diagonal has the same total): 7 2 9 | ? 6 4 | 3 10 5. What is the missing number?
  39. 39.Think of 3. Multiply it by 3, then add 7. What number do you end with?
  40. 40.9 × 3 = 2? — what is the missing digit?

Answer key

  1. 90
  2. 13
  3. 17
  4. 1089
  5. 33
  6. 2926
  7. 11000
  8. 20
  9. 276
  10. 5
  11. 63
  12. 26
  13. 84
  14. 8
  15. 81
  16. 47
  17. 2
  18. 128
  19. 104
  20. 11111
  21. 792
  22. Saturday
  23. 81
  24. 4
  25. 1089
  26. 41
  27. 13000
  28. 7480
  29. Saturday
  30. Friday
  31. 2
  32. 90
  33. 2
  34. 20
  35. Thursday
  36. 98765432
  37. 36
  38. 8
  39. 16
  40. 7

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