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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 689 · 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.If today is Sunday, what day was it 23 days ago? (a) Thursday (b) Monday (c) Saturday (d) Friday
  2. 2.9 × 10 =
  3. 3.37 × 3 =
  4. 4.If today is Tuesday, what day was it 12 days ago? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
  5. 5.9 × 9 = 8? — what is the missing digit?
  6. 6.1 + 3 + 5 + … + 21 =
  7. 7.9 × 9 =
  8. 8.43 × 100 =
  9. 9.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.76 × ? = 7600
  11. 11.1?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.If today is Friday, what day will it be after 62 days? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  13. 13.9 × 3 = 2? — what is the missing digit?
  14. 14.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 ? 23 | 21 11 13. What is the missing number?
  15. 15.63 × ? = 6300
  16. 16.12345679 × 54 =
  17. 17.The ages of two twins add up to 24. How old is each twin?
  18. 18.What comes next? 1, 9, 17, 25, ? (a) 34 (b) 41 (c) 25 (d) 33
  19. 19.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 ? | 8 18 4. What is the missing number?
  20. 20.Magic trick! Think of 20. Double it, add 4, halve it, then take away 20. What number do you get?
  21. 21.Half of 144 =
  22. 22.1 + 2 + 3 + … + 72 =
  23. 23.Magic square (every row, column and diagonal has the same total): ? 4 19 | 10 16 22 | 13 28 7. What is the missing number?
  24. 24.1 + 3 + 5 + … + 49 =
  25. 25.Take 800. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.Half of 156 =
  27. 27.37 × 4 =
  28. 28.Do the 1089 trick with 135: reverse and subtract, then reverse that answer and add. What do you get?
  29. 29.Magic square (every row, column and diagonal has the same total): 15 ? 17 | 16 14 12 | 11 18 13. What is the missing number?
  30. 30.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 2 years?
  31. 31.Think of 6. Multiply it by 4, then add 9. What number do you end with?
  32. 32.?281 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.Double 59 =
  34. 34.Half of 74 =
  35. 35.Think of 4. Multiply it by 2, then add 1. What number do you end with?
  36. 36.34 × 4 =
  37. 37.Think of 3. Multiply it by 5, then add 4. What number do you end with?
  38. 38.23 × 4 =
  39. 39.2 × 9 =
  40. 40.Do the 1089 trick with 911: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. Friday
  2. 90
  3. 111
  4. Thursday
  5. 1
  6. 121
  7. 81
  8. 4300
  9. 792
  10. 100
  11. 6
  12. Thursday
  13. 7
  14. 15
  15. 100
  16. 666666666
  17. 12
  18. 33
  19. 14
  20. 2
  21. 72
  22. 2628
  23. 25
  24. 625
  25. 792
  26. 78
  27. 148
  28. 1089
  29. 10
  30. 14
  31. 33
  32. 7
  33. 118
  34. 37
  35. 9
  36. 136
  37. 19
  38. 92
  39. 18
  40. 1089

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