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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 346 · 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. 1.17 × 4 =
  2. 2.9 × 3 = ?7 — what is the missing digit?
  3. 3.Odd one out: which number is NOT in the 5 times table? (a) 25 (b) 10 (c) 11 (d) 40
  4. 4.20 × 4 =
  5. 5.Half of 164 =
  6. 6.If today is Wednesday, what day was it 32 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  7. 7.9 × 2 = ?8 — what is the missing digit?
  8. 8.Magic square (every row, column and diagonal has the same total): 6 21 18 | 27 15 3 | 12 9 ?. What is the missing number?
  9. 9.Magic trick! Think of 10. Double it, add 14, halve it, then take away 10. What number do you get?
  10. 10.Magic square (every row, column and diagonal has the same total): 8 23 ? | 29 17 5 | 14 11 26. What is the missing number?
  11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  12. 12.In 5 years a boy will be 14 years old. How old was he 4 years ago?
  13. 13.A father is 43 years old and his son is 8. How old was the father when the son was born?
  14. 14.8 × 9 =
  15. 15.1 + 2 + 3 + … + 43 =
  16. 16.I thought of a number, added 7 and then doubled it. I got 28. What was my number?
  17. 17.The ages of two twins add up to 16. How old is each twin?
  18. 18.50 × 4 =
  19. 19.60?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.I thought of a number, added 8 and then doubled it. I got 46. What was my number?
  21. 21.9 × 9 = 8? — what is the missing digit?
  22. 22.Magic square (every row, column and diagonal has the same total): 23 ? 19 | 13 17 21 | 15 25 11. What is the missing number?
  23. 23.9 × 7 = ?3 — what is the missing digit?
  24. 24.Take 885. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.41 × 4 =
  26. 26.Magic square (every row, column and diagonal has the same total): 15 5 19 | 17 13 9 | 7 ? 11. What is the missing number?
  27. 27.I thought of a number, multiplied it by 3 and added 1. I got 40. What was my number?
  28. 28.9 × 5 = 4? — what is the missing digit?
  29. 29.If today is Monday, what day was it 40 days ago? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  30. 30.37 × 4 =
  31. 31.26? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.Magic square (every row, column and diagonal has the same total): ? 3 8 | 9 5 1 | 2 7 6. What is the missing number?
  33. 33.123456 × 8 + 6 =
  34. 34.37 × 21 =
  35. 35.3 × 9 =
  36. 36.What comes next? 19, 27, 35, 43, ? (a) 52 (b) 59 (c) 51 (d) 43
  37. 37.46 × ? = 46000
  38. 38.1 + 2 + 3 + … + 74 =
  39. 39.Think of 4. Multiply it by 3, then add 1. What number do you end with?
  40. 40.12345679 × 27 =

Answer key

  1. 68
  2. 2
  3. 11
  4. 80
  5. 82
  6. Saturday
  7. 1
  8. 24
  9. 7
  10. 20
  11. 495
  12. 5
  13. 35
  14. 72
  15. 946
  16. 7
  17. 8
  18. 200
  19. 7
  20. 15
  21. 1
  22. 9
  23. 6
  24. 297
  25. 164
  26. 21
  27. 13
  28. 5
  29. Wednesday
  30. 148
  31. 1
  32. 4
  33. 987654
  34. 777
  35. 27
  36. 51
  37. 1000
  38. 2775
  39. 13
  40. 333333333

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