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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 490 · 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. 1.31 × 4 =
  2. 2.A piggy bank has 2 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
  3. 3.1 + 2 + 3 + … + 17 =
  4. 4.9 × 7 = 6? — what is the missing digit?
  5. 5.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
  6. 6.The 2nd of a month is a Friday. What day is the 21st of the same month? (a) Wednesday (b) Thursday (c) Saturday (d) Tuesday
  7. 7.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 6 years?
  8. 8.Odd one out: which number is NOT in the 8 times table? (a) 32 (b) 56 (c) 60 (d) 64
  9. 9.Magic square (every row, column and diagonal has the same total): ? 1 6 | 3 5 7 | 4 9 2. What is the missing number?
  10. 10.Double 74 =
  11. 11.Think of 3. Multiply it by 5, then add 2. What number do you end with?
  12. 12.39 × 4 =
  13. 13.1 + 2 + 3 + … + 82 =
  14. 14.891 + 198 =
  15. 15.Magic square (every row, column and diagonal has the same total): 5 10 3 | 4 6 8 | 9 ? 7. What is the missing number?
  16. 16.1 + 2 + 3 + … + 73 =
  17. 17.26 × 4 =
  18. 18.If today is Thursday, what day will it be after 61 days? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  19. 19.1 + 3 + 5 + … + 19 =
  20. 20.9 × 6 =
  21. 21.2 × 9 =
  22. 22.?832 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.28 × 100 =
  24. 24.If today is Friday, what day was it 42 days ago? (a) Saturday (b) Thursday (c) Monday (d) Friday
  25. 25.30 × 1000 =
  26. 26.9 × 8 = 7? — what is the missing digit?
  27. 27.In 2 years a boy will be 15 years old. How old was he 5 years ago?
  28. 28.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.Magic trick! Think of 11. Double it, add 12, halve it, then take away 11. What number do you get?
  30. 30.Magic trick! Think of 7. Double it, add 18, halve it, then take away 7. What number do you get?
  31. 31.30 × 4 =
  32. 32.29 × ? = 2900
  33. 33.11 × 4 =
  34. 34.If today is Thursday, what day will it be after 10 days? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
  35. 35.1234567 × 9 + 8 =
  36. 36.8 × 9 =
  37. 37.9 × 10 = ?0 — what is the missing digit?
  38. 38.269? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.111111 × 111111 =
  40. 40.Magic square (every row, column and diagonal has the same total): 16 18 ? | 6 14 22 | 20 10 12. What is the missing number?

Answer key

  1. 124
  2. 26
  3. 153
  4. 3
  5. 4
  6. Wednesday
  7. 20
  8. 60
  9. 8
  10. 148
  11. 17
  12. 156
  13. 3403
  14. 1089
  15. 2
  16. 2701
  17. 104
  18. Tuesday
  19. 100
  20. 54
  21. 18
  22. 5
  23. 2800
  24. Friday
  25. 30000
  26. 2
  27. 8
  28. 891
  29. 6
  30. 9
  31. 120
  32. 100
  33. 44
  34. Sunday
  35. 11111111
  36. 72
  37. 9
  38. 1
  39. 12345654321
  40. 8

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