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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 778 · 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.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 98 (c) 101 (d) 100
  2. 2.Take 52 and take away the sum of its digits. What do you get?
  3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  4. 4.1 + 2 + 3 + … + 99 =
  5. 5.1 + 2 + 3 + … + 100 =
  6. 6.?151 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.627 × 10 =
  8. 8.9 × 5 = 4? — what is the missing digit?
  9. 9.9 × 7 =
  10. 10.792 + 297 =
  11. 11.Double 34 =
  12. 12.?021 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.9 × 10 =
  14. 14.I thought of a number, added 8 and then doubled it. I got 34. What was my number?
  15. 15.The ages of two twins add up to 30. How old is each twin?
  16. 16.9 × 8 =
  17. 17.9 × 9 = 8? — what is the missing digit?
  18. 18.Magic square (every row, column and diagonal has the same total): 19 9 11 | 5 13 21 | 15 ? 7. What is the missing number?
  19. 19.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 16 ? | 14 24 10. What is the missing number?
  20. 20.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 31 (c) 35 (d) 45
  21. 21.37 × 3 =
  22. 22.A father is 30 years old and his son is 7. How old was the father when the son was born?
  23. 23.9 × 3 = 2? — what is the missing digit?
  24. 24.97 × ? = 9700
  25. 25.9 × 2 = ?8 — what is the missing digit?
  26. 26.50 × 4 =
  27. 27.123456789 × 8 + 9 =
  28. 28.7 × 9 =
  29. 29.49 × 4 =
  30. 30.Take 19 and take away the sum of its digits. What do you get?
  31. 31.34 × 4 =
  32. 32.12345679 × 9 =
  33. 33.Magic square (every row, column and diagonal has the same total): 21 24 ? | 6 18 30 | 27 12 15. What is the missing number?
  34. 34.Magic trick! Think of 14. Double it, add 16, halve it, then take away 14. What number do you get?
  35. 35.What comes next? 18, 21, 24, 27, ? (a) 30 (b) 31 (c) 33 (d) 27
  36. 36.In 3 years a boy will be 17 years old. How old was he 5 years ago?
  37. 37.If today is Friday, what day will it be after 80 days? (a) Monday (b) Tuesday (c) Thursday (d) Sunday
  38. 38.59 × ? = 5900
  39. 39.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  40. 40.1 + 3 + 5 + … + 9 =

Answer key

  1. 100
  2. 45
  3. 891
  4. 4950
  5. 5050
  6. 2
  7. 6270
  8. 5
  9. 63
  10. 1089
  11. 68
  12. 6
  13. 90
  14. 9
  15. 15
  16. 72
  17. 1
  18. 17
  19. 20
  20. 31
  21. 111
  22. 23
  23. 7
  24. 100
  25. 1
  26. 200
  27. 987654321
  28. 63
  29. 196
  30. 9
  31. 136
  32. 111111111
  33. 9
  34. 8
  35. 30
  36. 9
  37. Monday
  38. 100
  39. 693
  40. 25

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