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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 821 · 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. 1.41 × 100 =
  2. 2.2 × ? = 2000
  3. 3.27 × 4 =
  4. 4.9 × 9 = ?1 — what is the missing digit?
  5. 5.46?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.13 × 1000 =
  7. 7.1 + 2 + 3 + … + 12 =
  8. 8.A father is 42 years old and his son is 12. How old was the father when the son was born?
  9. 9.The ages of two twins add up to 24. How old is each twin?
  10. 10.1 + 2 + 3 + … + 15 =
  11. 11.9 × 6 =
  12. 12.1 + 3 + 5 + … + 47 =
  13. 13.I thought of a number, added 9 and then doubled it. I got 32. What was my number?
  14. 14.43 × 4 =
  15. 15.9 × 4 = ?6 — what is the missing digit?
  16. 16.1 + 2 + 3 + … + 56 =
  17. 17.Magic square (every row, column and diagonal has the same total): ? 20 10 | 16 12 8 | 14 4 18. What is the missing number?
  18. 18.10 × 9 =
  19. 19.Take 690. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.9 × 7 = ?3 — what is the missing digit?
  21. 21.12345678 × 9 + 9 =
  22. 22.1 + 2 + 3 + … + 75 =
  23. 23.12 × 9 + 3 =
  24. 24.505 × ? = 5050
  25. 25.If today is Saturday, what day was it 19 days ago? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
  26. 26.6 × 9 =
  27. 27.39 × 1000 =
  28. 28.If today is Monday, what day will it be after 94 days? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
  29. 29.44 × 1000 =
  30. 30.Double 31 =
  31. 31.990 × 10 =
  32. 32.Think of 9. Multiply it by 3, then add 1. What number do you end with?
  33. 33.8 × 9 =
  34. 34.29 × 4 =
  35. 35.55?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.623? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.9 × 6 = ?4 — what is the missing digit?
  38. 38.Magic square (every row, column and diagonal has the same total): 14 35 20 | 29 23 17 | ? 11 32. What is the missing number?
  39. 39.56 × 100 =
  40. 40.What comes next? 18, 24, 30, 36, ? (a) 48 (b) 42 (c) 43 (d) 36

Answer key

  1. 4100
  2. 1000
  3. 108
  4. 8
  5. 8
  6. 13000
  7. 78
  8. 30
  9. 12
  10. 120
  11. 54
  12. 576
  13. 7
  14. 172
  15. 3
  16. 1596
  17. 6
  18. 90
  19. 594
  20. 6
  21. 111111111
  22. 2850
  23. 111
  24. 10
  25. Monday
  26. 54
  27. 39000
  28. Thursday
  29. 44000
  30. 62
  31. 9900
  32. 28
  33. 72
  34. 116
  35. 8
  36. 7
  37. 5
  38. 26
  39. 5600
  40. 42

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