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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 970 · 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 × 9 = ?1 — what is the missing digit?
  2. 2.11 × 11 =
  3. 3.37 × 6 =
  4. 4.60 × ? = 6000
  5. 5.21 × 4 =
  6. 6.1 + 2 + 3 + … + 98 =
  7. 7.12345678 × 9 + 9 =
  8. 8.9 × 2 =
  9. 9.1 + 2 + 3 + … + 47 =
  10. 10.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 6 years?
  11. 11.16?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Double 96 =
  13. 13.Take 60 and take away the sum of its digits. What do you get?
  14. 14.Magic square (every row, column and diagonal has the same total): 10 17 12 | 15 13 11 | 14 9 ?. What is the missing number?
  15. 15.9 × 10 = ?0 — what is the missing digit?
  16. 16.Magic square (every row, column and diagonal has the same total): 3 10 5 | ? 6 4 | 7 2 9. What is the missing number?
  17. 17.I thought of a number, added 2 and then doubled it. I got 38. What was my number?
  18. 18.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 60 (c) 70 (d) 81
  19. 19.40 × 1000 =
  20. 20.63 × 100 =
  21. 21.Take 972. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 7 years?
  23. 23.37 × 21 =
  24. 24.Magic square (every row, column and diagonal has the same total): 13 15 ? | 3 11 19 | 17 7 9. What is the missing number?
  25. 25.88?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Magic square (every row, column and diagonal has the same total): 18 33 12 | 15 21 27 | 30 ? 24. What is the missing number?
  27. 27.If today is Saturday, what day was it 21 days ago? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  28. 28.297 + 792 =
  29. 29.If today is Saturday, what day will it be after 54 days? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  30. 30.1 + 2 + 3 + … + 25 =
  31. 31.75 × 100 =
  32. 32.9 × 3 =
  33. 33.12345679 × 45 =
  34. 34.Magic square (every row, column and diagonal has the same total): 20 22 ? | 10 18 26 | 24 14 16. What is the missing number?
  35. 35.6?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Magic square (every row, column and diagonal has the same total): 17 12 13 | ? 14 18 | 15 16 11. What is the missing number?
  37. 37.If today is Monday, what day will it be after 13 days? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
  38. 38.Magic trick! Think of 17. Double it, add 10, halve it, then take away 17. What number do you get?
  39. 39.Take 801. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  40. 40.Double 41 =

Answer key

  1. 8
  2. 121
  3. 222
  4. 100
  5. 84
  6. 4851
  7. 111111111
  8. 18
  9. 1128
  10. 20
  11. 8
  12. 192
  13. 54
  14. 16
  15. 9
  16. 8
  17. 17
  18. 80
  19. 40000
  20. 6300
  21. 693
  22. 18
  23. 777
  24. 5
  25. 5
  26. 9
  27. Saturday
  28. 1089
  29. Thursday
  30. 325
  31. 7500
  32. 27
  33. 555555555
  34. 12
  35. 8
  36. 10
  37. Sunday
  38. 5
  39. 693
  40. 82

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