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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 136 · 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 × 4 =
  2. 2.11 × 11 =
  3. 3.A girl is 5 years old and her brother is 3 years older. How old will her brother be in 2 years?
  4. 4.9 × 6 = 5? — what is the missing digit?
  5. 5.15 × 4 =
  6. 6.Magic square (every row, column and diagonal has the same total): 6 ? 8 | 11 9 7 | 10 5 12. What is the missing number?
  7. 7.65?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Take 903. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.50 × 4 =
  10. 10.Double 69 =
  11. 11.Double 57 =
  12. 12.24 × 4 =
  13. 13.1 + 2 + 3 + … + 84 =
  14. 14.Take 972. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.Double 51 =
  16. 16.The 8th of a month is a Sunday. What day is the 26th of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  17. 17.48 × 1000 =
  18. 18.847 × 10 =
  19. 19.1 + 2 + 3 + … + 7 =
  20. 20.What comes next? 2, 5, 8, 11, ? (a) 15 (b) 11 (c) 14 (d) 17
  21. 21.9 × 4 = ?6 — what is the missing digit?
  22. 22.13 × 1000 =
  23. 23.Half of 178 =
  24. 24.9 × 3 = ?7 — what is the missing digit?
  25. 25.4?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.If today is Monday, what day will it be after 70 days? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
  27. 27.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
  28. 28.If today is Saturday, what day will it be after 82 days? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  29. 29.Magic square (every row, column and diagonal has the same total): 26 29 14 | ? 23 35 | 32 17 20. What is the missing number?
  30. 30.What comes next? 12, 17, 22, 27, ? (a) 27 (b) 32 (c) 37 (d) 33
  31. 31.9 × 6 = ?4 — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 9 10 5 | 4 ? 12 | 11 6 7. What is the missing number?
  33. 33.123456 × 8 + 6 =
  34. 34.?928 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.A piggy bank has 5 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  36. 36.What comes next? 2, 7, 12, 17, ? (a) 22 (b) 17 (c) 27 (d) 23
  37. 37.9 × 9 =
  38. 38.1234567 × 9 + 8 =
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  40. 40.Take 24 and take away the sum of its digits. What do you get?

Answer key

  1. 148
  2. 121
  3. 10
  4. 4
  5. 60
  6. 13
  7. 5
  8. 594
  9. 200
  10. 138
  11. 114
  12. 96
  13. 3570
  14. 693
  15. 102
  16. Thursday
  17. 48000
  18. 8470
  19. 28
  20. 14
  21. 3
  22. 13000
  23. 89
  24. 2
  25. 2
  26. Monday
  27. 1089
  28. Thursday
  29. 11
  30. 32
  31. 5
  32. 8
  33. 987654
  34. 8
  35. 41
  36. 22
  37. 81
  38. 11111111
  39. 297
  40. 18

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