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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 537 · 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 16. How old is each twin?
  2. 2.Think of 4. Multiply it by 2, then add 9. What number do you end with?
  3. 3.Magic trick! Think of 20. Double it, add 6, halve it, then take away 20. What number do you get?
  4. 4.9 × 10 =
  5. 5.The 5th of a month is a Monday. What day is the 17th of the same month? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  6. 6.1 + 2 + 3 + … + 71 =
  7. 7.59?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 7 years?
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  10. 10.Magic trick! Think of 15. Double it, add 6, halve it, then take away 15. What number do you get?
  11. 11.11 × 4 =
  12. 12.If today is Thursday, what day was it 47 days ago? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  13. 13.What comes next? 3, 12, 21, 30, ? (a) 48 (b) 30 (c) 40 (d) 39
  14. 14.1234 × 9 + 5 =
  15. 15.If today is Friday, what day will it be after 14 days? (a) Friday (b) Monday (c) Saturday (d) Thursday
  16. 16.6 × 9 =
  17. 17.9 × 7 = ?3 — what is the missing digit?
  18. 18.Half of 102 =
  19. 19.Magic square (every row, column and diagonal has the same total): 7 14 9 | 12 10 8 | 11 6 ?. What is the missing number?
  20. 20.36 × 1000 =
  21. 21.I thought of a number, added 7 and then doubled it. I got 38. What was my number?
  22. 22.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 64 (c) 66 (d) 65
  23. 23.Take 129. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.17 × 4 =
  25. 25.If today is Tuesday, what day was it 25 days ago? (a) Thursday (b) Friday (c) Monday (d) Saturday
  26. 26.If today is Friday, what day was it 21 days ago? (a) Friday (b) Thursday (c) Monday (d) Saturday
  27. 27.41 × 4 =
  28. 28.18 × ? = 18000
  29. 29.The ages of two twins add up to 26. How old is each twin?
  30. 30.13 × 4 =
  31. 31.9 × 3 = 2? — what is the missing digit?
  32. 32.1 + 2 + 3 + … + 31 =
  33. 33.What comes next? 19, 21, 23, 25, ? (a) 28 (b) 29 (c) 25 (d) 27
  34. 34.If today is Saturday, what day will it be after 46 days? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  35. 35.I thought of a number, multiplied it by 3 and added 3. I got 18. What was my number?
  36. 36.Odd one out: which number is NOT in the 3 times table? (a) 26 (b) 21 (c) 24 (d) 12
  37. 37.Double 86 =
  38. 38.8 × 9 =
  39. 39.Half of 94 =
  40. 40.792 + 297 =

Answer key

  1. 8
  2. 17
  3. 3
  4. 90
  5. Saturday
  6. 2556
  7. 1
  8. 16
  9. 891
  10. 3
  11. 44
  12. Saturday
  13. 39
  14. 11111
  15. Friday
  16. 54
  17. 6
  18. 51
  19. 13
  20. 36000
  21. 12
  22. 64
  23. 792
  24. 68
  25. Friday
  26. Friday
  27. 164
  28. 1000
  29. 13
  30. 52
  31. 7
  32. 496
  33. 27
  34. Wednesday
  35. 5
  36. 26
  37. 172
  38. 72
  39. 47
  40. 1089

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