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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 320 · 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): 7 12 5 | 6 8 ? | 11 4 9. What is the missing number?
  2. 2.41 × 1000 =
  3. 3.Double 29 =
  4. 4.If today is Wednesday, what day will it be after 41 days? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  5. 5.If today is Wednesday, what day was it 12 days ago? (a) Monday (b) Saturday (c) Thursday (d) Friday
  6. 6.28 × 1000 =
  7. 7.50 × 4 =
  8. 8.Do the 1089 trick with 570: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 25 (d) 26
  10. 10.Magic square (every row, column and diagonal has the same total): ? 11 6 | 5 9 13 | 12 7 8. What is the missing number?
  11. 11.9 × 9 =
  12. 12.Double 41 =
  13. 13.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 98 (c) 100 (d) 102
  14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  15. 15.Take 951. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  16. 16.10 × 9 =
  17. 17.Magic square (every row, column and diagonal has the same total): 13 23 21 | 27 ? 11 | 17 15 25. What is the missing number?
  18. 18.The 3rd of a month is a Friday. What day is the 12th of the same month? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  19. 19.The ages of two twins add up to 8. How old is each twin?
  20. 20.31 × ? = 31000
  21. 21.A father is 32 years old and his son is 6. How old was the father when the son was born?
  22. 22.?035 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Odd one out: which number is NOT in the 5 times table? (a) 23 (b) 15 (c) 25 (d) 20
  24. 24.12345679 × 27 =
  25. 25.If today is Thursday, what day was it 9 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  26. 26.1 × 9 =
  27. 27.9 × 3 =
  28. 28.Do the 1089 trick with 511: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.The 3rd of a month is a Sunday. What day is the 20th of the same month? (a) Thursday (b) Wednesday (c) Saturday (d) Tuesday
  30. 30.1 + 2 + 3 + … + 10 =
  31. 31.9 × 3 = ?7 — what is the missing digit?
  32. 32.Half of 182 =
  33. 33.33 × 4 =
  34. 34.Double 38 =
  35. 35.Magic trick! Think of 14. Double it, add 16, halve it, then take away 14. What number do you get?
  36. 36.Magic square (every row, column and diagonal has the same total): 2 9 4 | 7 5 3 | 6 1 ?. What is the missing number?
  37. 37.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 4 years?
  38. 38.Double 62 =
  39. 39.If today is Sunday, what day will it be after 32 days? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
  40. 40.Magic trick! Think of 10. Double it, add 10, halve it, then take away 10. What number do you get?

Answer key

  1. 10
  2. 41000
  3. 58
  4. Tuesday
  5. Friday
  6. 28000
  7. 200
  8. 1089
  9. 25
  10. 10
  11. 81
  12. 82
  13. 100
  14. 693
  15. 792
  16. 90
  17. 19
  18. Sunday
  19. 4
  20. 1000
  21. 26
  22. 1
  23. 23
  24. 333333333
  25. Tuesday
  26. 9
  27. 27
  28. 1089
  29. Wednesday
  30. 55
  31. 2
  32. 91
  33. 132
  34. 76
  35. 8
  36. 8
  37. 16
  38. 124
  39. Thursday
  40. 5

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