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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 765 · 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. 1.1 + 3 + 5 + … + 31 =
  2. 2.If today is Wednesday, what day was it 11 days ago? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  3. 3.9 × 10 =
  4. 4.9 × 4 = ?6 — what is the missing digit?
  5. 5.50 × 4 =
  6. 6.36 × 1000 =
  7. 7.Magic square (every row, column and diagonal has the same total): 27 12 33 | 30 24 18 | 15 36 ?. What is the missing number?
  8. 8.Magic square (every row, column and diagonal has the same total): 4 11 ? | 9 7 5 | 8 3 10. What is the missing number?
  9. 9.Double 77 =
  10. 10.18 × 4 =
  11. 11.9 × 8 =
  12. 12.I thought of a number, multiplied it by 3 and added 2. I got 8. What was my number?
  13. 13.111 × 111 =
  14. 14.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 6 years?
  15. 15.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 9 years?
  16. 16.Magic square (every row, column and diagonal has the same total): ? 14 13 | 16 12 8 | 11 10 15. What is the missing number?
  17. 17.4 × 9 =
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  19. 19.I thought of a number, added 1 and then doubled it. I got 24. What was my number?
  20. 20.The 7th of a month is a Saturday. What day is the 22nd of the same month? (a) Monday (b) Wednesday (c) Saturday (d) Sunday
  21. 21.Take 370. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.Magic square (every row, column and diagonal has the same total): 16 31 10 | 13 ? 25 | 28 7 22. What is the missing number?
  23. 23.31 × 4 =
  24. 24.1 + 2 + 3 + … + 28 =
  25. 25.9 × 5 = ?5 — what is the missing digit?
  26. 26.Odd one out: which number is NOT in the 5 times table? (a) 39 (b) 10 (c) 30 (d) 15
  27. 27.I thought of a number, added 3 and then doubled it. I got 14. What was my number?
  28. 28.12345679 × 63 =
  29. 29.I thought of a number, multiplied it by 5 and added 3. I got 38. What was my number?
  30. 30.6 × 4 =
  31. 31.?060 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.21 × 4 =
  33. 33.Do the 1089 trick with 381: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.9 × 9 = ?1 — what is the missing digit?
  35. 35.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 26 (c) 27 (d) 23
  36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  37. 37.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 3 | 6 ? 10. What is the missing number?
  38. 38.10 × ? = 1000
  39. 39.The 6th of a month is a Saturday. What day is the 25th of the same month? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
  40. 40.Double 56 =

Answer key

  1. 256
  2. Saturday
  3. 90
  4. 3
  5. 200
  6. 36000
  7. 21
  8. 6
  9. 154
  10. 72
  11. 72
  12. 2
  13. 12321
  14. 23
  15. 19
  16. 9
  17. 36
  18. 495
  19. 11
  20. Sunday
  21. 297
  22. 19
  23. 124
  24. 406
  25. 4
  26. 39
  27. 4
  28. 777777777
  29. 7
  30. 24
  31. 3
  32. 84
  33. 1089
  34. 8
  35. 25
  36. 297
  37. 5
  38. 100
  39. Thursday
  40. 112

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