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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 166 · 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 22. How old is each twin?
  2. 2.12345679 × 36 =
  3. 3.38 × ? = 3800
  4. 4.Think of 12. Multiply it by 2, then add 3. What number do you end with?
  5. 5.9 × 2 = ?8 — what is the missing digit?
  6. 6.584 × ? = 5840
  7. 7.Magic square (every row, column and diagonal has the same total): 26 5 20 | ? 17 23 | 14 29 8. What is the missing number?
  8. 8.38 × 4 =
  9. 9.Do the 1089 trick with 703: reverse and subtract, then reverse that answer and add. What do you get?
  10. 10.792 + 297 =
  11. 11.9 × 6 = ?4 — what is the missing digit?
  12. 12.1 + 3 + 5 + … + 23 =
  13. 13.If today is Friday, what day was it 25 days ago? (a) Thursday (b) Tuesday (c) Sunday (d) Monday
  14. 14.37 × 3 =
  15. 15.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 47 (c) 51 (d) 49
  16. 16.The ages of two twins add up to 10. How old is each twin?
  17. 17.Double 51 =
  18. 18.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.?832 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.41 × 4 =
  21. 21.9 × 4 = 3? — what is the missing digit?
  22. 22.9 × 4 =
  23. 23.9 × 4 = ?6 — what is the missing digit?
  24. 24.Think of 11. Multiply it by 5, then add 3. What number do you end with?
  25. 25.The 1st of a month is a Saturday. What day is the 13th of the same month? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
  26. 26.Magic square (every row, column and diagonal has the same total): 6 7 2 | 1 5 9 | 8 3 ?. What is the missing number?
  27. 27.4?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.The 4th of a month is a Sunday. What day is the 30th of the same month? (a) Friday (b) Saturday (c) Thursday (d) Monday
  29. 29.1 + 2 + 3 + … + 83 =
  30. 30.Odd one out: which number is NOT in the 3 times table? (a) 12 (b) 9 (c) 23 (d) 18
  31. 31.9 × 6 =
  32. 32.If today is Thursday, what day will it be after 19 days? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  33. 33.Magic trick! Think of 5. Double it, add 4, halve it, then take away 5. What number do you get?
  34. 34.834 × ? = 8340
  35. 35.9 × 10 = ?0 — what is the missing digit?
  36. 36.5?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.5?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  39. 39.Double 69 =
  40. 40.Double 92 =

Answer key

  1. 11
  2. 444444444
  3. 100
  4. 27
  5. 1
  6. 10
  7. 11
  8. 152
  9. 1089
  10. 1089
  11. 5
  12. 144
  13. Monday
  14. 111
  15. 49
  16. 5
  17. 102
  18. 1089
  19. 5
  20. 164
  21. 6
  22. 36
  23. 3
  24. 58
  25. Thursday
  26. 4
  27. 6
  28. Friday
  29. 3486
  30. 23
  31. 54
  32. Tuesday
  33. 2
  34. 10
  35. 9
  36. 5
  37. 6
  38. 198
  39. 138
  40. 184

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