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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 678 · 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.If today is Wednesday, what day was it 9 days ago? (a) Monday (b) Tuesday (c) Thursday (d) Sunday
  2. 2.Double 32 =
  3. 3.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 8 years?
  4. 4.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 24 (c) 23 (d) 8
  5. 5.9 × 4 =
  6. 6.6?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.If today is Thursday, what day will it be after 11 days? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  8. 8.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 61 (c) 36 (d) 45
  9. 9.Magic square (every row, column and diagonal has the same total): ? 11 10 | 13 9 5 | 8 7 12. What is the missing number?
  10. 10.844? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.9 × 5 = ?5 — what is the missing digit?
  12. 12.31 × 4 =
  13. 13.Magic square (every row, column and diagonal has the same total): 17 7 21 | ? 15 11 | 9 23 13. What is the missing number?
  14. 14.1 + 2 + 3 + … + 34 =
  15. 15.Double 28 =
  16. 16.If today is Saturday, what day was it 18 days ago? (a) Wednesday (b) Tuesday (c) Monday (d) Friday
  17. 17.904 × 10 =
  18. 18.1 + 3 + 5 + … + 33 =
  19. 19.If today is Thursday, what day was it 20 days ago? (a) Friday (b) Thursday (c) Monday (d) Saturday
  20. 20.198 + 891 =
  21. 21.32 × 4 =
  22. 22.8 × 4 =
  23. 23.9 × 2 =
  24. 24.1 + 2 + 3 + … + 44 =
  25. 25.?07 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.1 + 2 + 3 + … + 45 =
  27. 27.1 + 3 + 5 + … + 25 =
  28. 28.9 × 2 = ?8 — what is the missing digit?
  29. 29.Double 48 =
  30. 30.9 × 6 =
  31. 31.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  32. 32.9 × 3 = 2? — what is the missing digit?
  33. 33.9 × 7 = 6? — what is the missing digit?
  34. 34.Do the 1089 trick with 218: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  36. 36.If today is Saturday, what day was it 14 days ago? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  37. 37.Double 24 =
  38. 38.Think of 10. Multiply it by 3, then add 2. What number do you end with?
  39. 39.22 × ? = 2200
  40. 40.If today is Tuesday, what day was it 56 days ago? (a) Wednesday (b) Monday (c) Friday (d) Tuesday

Answer key

  1. Monday
  2. 64
  3. 18
  4. 23
  5. 36
  6. 3
  7. Monday
  8. 61
  9. 6
  10. 2
  11. 4
  12. 124
  13. 19
  14. 595
  15. 56
  16. Tuesday
  17. 9040
  18. 289
  19. Friday
  20. 1089
  21. 128
  22. 32
  23. 18
  24. 990
  25. 2
  26. 1035
  27. 169
  28. 1
  29. 96
  30. 54
  31. 2
  32. 7
  33. 3
  34. 1089
  35. 198
  36. Saturday
  37. 48
  38. 32
  39. 100
  40. Tuesday

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