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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 375 · 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.Magic square (every row, column and diagonal has the same total): 14 12 22 | 24 ? 8 | 10 20 18. What is the missing number?
  2. 2.What comes next? 14, 21, 28, 35, ? (a) 43 (b) 35 (c) 49 (d) 42
  3. 3.52 × 4 =
  4. 4.Double 66 =
  5. 5.If today is Saturday, what day was it 29 days ago? (a) Saturday (b) Friday (c) Monday (d) Thursday
  6. 6.Magic trick! Think of 9. Double it, add 10, halve it, then take away 9. What number do you get?
  7. 7.9 × 2 = ?8 — what is the missing digit?
  8. 8.9 × 9 = ?1 — what is the missing digit?
  9. 9.44 × ? = 44000
  10. 10.If today is Tuesday, what day will it be after 100 days? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  11. 11.Double 58 =
  12. 12.12 × 9 + 3 =
  13. 13.Take 35 and take away the sum of its digits. What do you get?
  14. 14.6?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.9 × 4 = 3? — what is the missing digit?
  16. 16.The 7th of a month is a Wednesday. What day is the 30th of the same month? (a) Friday (b) Thursday (c) Monday (d) Saturday
  17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  18. 18.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 38 (c) 36 (d) 37
  19. 19.9 × 7 = 6? — what is the missing digit?
  20. 20.I thought of a number, multiplied it by 4 and added 2. I got 30. What was my number?
  21. 21.Magic square (every row, column and diagonal has the same total): 5 12 7 | 10 8 6 | ? 4 11. What is the missing number?
  22. 22.I thought of a number, added 4 and then doubled it. I got 38. What was my number?
  23. 23.95 × 100 =
  24. 24.The ages of two twins add up to 22. How old is each twin?
  25. 25.34 × 4 =
  26. 26.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 101 (d) 100
  27. 27.A father is 45 years old and his son is 9. How old was the father when the son was born?
  28. 28.9 × 3 =
  29. 29.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 50 (c) 51 (d) 49
  30. 30.2 × 9 =
  31. 31.I thought of a number, multiplied it by 5 and added 8. I got 83. What was my number?
  32. 32.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 8 years?
  33. 33.?791 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.26 × 4 =
  35. 35.9 × 3 = 2? — what is the missing digit?
  36. 36.18 × 4 =
  37. 37.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
  38. 38.1111 × 1111 =
  39. 39.44 × 4 =
  40. 40.Magic square (every row, column and diagonal has the same total): 12 17 10 | 11 13 ? | 16 9 14. What is the missing number?

Answer key

  1. 16
  2. 42
  3. 208
  4. 132
  5. Friday
  6. 5
  7. 1
  8. 8
  9. 1000
  10. Thursday
  11. 116
  12. 111
  13. 27
  14. 5
  15. 6
  16. Friday
  17. 495
  18. 36
  19. 3
  20. 7
  21. 9
  22. 15
  23. 9500
  24. 11
  25. 136
  26. 100
  27. 36
  28. 27
  29. 49
  30. 18
  31. 15
  32. 20
  33. 1
  34. 104
  35. 7
  36. 72
  37. 5
  38. 1234321
  39. 176
  40. 15

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