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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 972 · 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. 1.9 × 2 = 1? — what is the missing digit?
  2. 2.297 + 792 =
  3. 3.Magic square (every row, column and diagonal has the same total): 10 3 8 | ? 7 9 | 6 11 4. What is the missing number?
  4. 4.If today is Thursday, what day will it be after 82 days? (a) Friday (b) Tuesday (c) Wednesday (d) Monday
  5. 5.1 + 3 + 5 + … + 45 =
  6. 6.39 × 4 =
  7. 7.43 × 1000 =
  8. 8.9 × 1 =
  9. 9.Double 92 =
  10. 10.27 × 4 =
  11. 11.31 × 4 =
  12. 12.A father is 36 years old and his son is 5. How old was the father when the son was born?
  13. 13.9 × 4 = 3? — what is the missing digit?
  14. 14.Take 955. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  15. 15.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 9 years?
  16. 16.A father is 37 years old and his son is 8. How old was the father when the son was born?
  17. 17.3 × ? = 3000
  18. 18.626 × ? = 6260
  19. 19.Magic square (every row, column and diagonal has the same total): 15 10 ? | 8 12 16 | 13 14 9. What is the missing number?
  20. 20.69?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  22. 22.Double 23 =
  23. 23.9 × 7 = ?3 — what is the missing digit?
  24. 24.The ages of two twins add up to 10. How old is each twin?
  25. 25.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
  26. 26.Double 53 =
  27. 27.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 28 (c) 12 (d) 33
  28. 28.32 × 4 =
  29. 29.20 × 4 =
  30. 30.The 5th of a month is a Sunday. What day is the 23rd of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  31. 31.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
  32. 32.47 × 4 =
  33. 33.Odd one out: which number is NOT in the 7 times table? (a) 56 (b) 42 (c) 28 (d) 36
  34. 34.Take 36 and take away the sum of its digits. What do you get?
  35. 35.14 × ? = 14000
  36. 36.78?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Take 54 and take away the sum of its digits. What do you get?
  38. 38.1 + 2 + 3 + … + 11 =
  39. 39.198 + 891 =
  40. 40.123 × 9 + 4 =

Answer key

  1. 8
  2. 1089
  3. 5
  4. Tuesday
  5. 529
  6. 156
  7. 43000
  8. 9
  9. 184
  10. 108
  11. 124
  12. 31
  13. 6
  14. 396
  15. 25
  16. 29
  17. 1000
  18. 10
  19. 11
  20. 9
  21. 198
  22. 46
  23. 6
  24. 5
  25. 4
  26. 106
  27. 33
  28. 128
  29. 80
  30. Thursday
  31. 25
  32. 188
  33. 36
  34. 27
  35. 1000
  36. 7
  37. 45
  38. 66
  39. 1089
  40. 1111

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