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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 184 · 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. 1.30 × 4 =
  2. 2.Double 27 =
  3. 3.?731 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.1 + 2 + 3 + … + 36 =
  5. 5.Half of 58 =
  6. 6.37 × 21 =
  7. 7.11111 × 11111 =
  8. 8.Double 46 =
  9. 9.If today is Tuesday, what day was it 15 days ago? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
  10. 10.Half of 112 =
  11. 11.12345679 × 9 =
  12. 12.9 × 2 = 1? — what is the missing digit?
  13. 13.If today is Sunday, what day will it be after 83 days? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
  14. 14.Half of 42 =
  15. 15.Double 11 =
  16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  17. 17.319 × 10 =
  18. 18.9 × 10 = 9? — what is the missing digit?
  19. 19.47 × 100 =
  20. 20.9 × 4 =
  21. 21.Take 206. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.9 × 2 = ?8 — what is the missing digit?
  23. 23.Odd one out: which number is NOT in the 9 times table? (a) 63 (b) 49 (c) 18 (d) 36
  24. 24.5 × 9 =
  25. 25.Double 95 =
  26. 26.Magic square (every row, column and diagonal has the same total): 10 20 6 | 8 12 16 | 18 ? 14. What is the missing number?
  27. 27.723? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.47 × 4 =
  29. 29.9 × 1 =
  30. 30.16 × 4 =
  31. 31.Magic square (every row, column and diagonal has the same total): 21 ? 25 | 23 19 15 | 13 27 17. What is the missing number?
  32. 32.Magic square (every row, column and diagonal has the same total): 12 ? 24 | 27 15 3 | 6 21 18. What is the missing number?
  33. 33.If today is Thursday, what day was it 29 days ago? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
  34. 34.Half of 192 =
  35. 35.84 × ? = 8400
  36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  37. 37.29 × 4 =
  38. 38.Magic square (every row, column and diagonal has the same total): 12 2 16 | ? 10 6 | 4 18 8. What is the missing number?
  39. 39.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 9 years?
  40. 40.The ages of two twins add up to 18. How old is each twin?

Answer key

  1. 120
  2. 54
  3. 7
  4. 666
  5. 29
  6. 777
  7. 123454321
  8. 92
  9. Monday
  10. 56
  11. 111111111
  12. 8
  13. Saturday
  14. 21
  15. 22
  16. 891
  17. 3190
  18. 0
  19. 4700
  20. 36
  21. 396
  22. 1
  23. 49
  24. 45
  25. 190
  26. 4
  27. 6
  28. 188
  29. 9
  30. 64
  31. 11
  32. 9
  33. Wednesday
  34. 96
  35. 100
  36. 297
  37. 116
  38. 14
  39. 16
  40. 9

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