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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 74 · 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.Double 36 =
  2. 2.9 × 10 = 9? — what is the missing digit?
  3. 3.If today is Friday, what day was it 18 days ago? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
  4. 4.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 9 years?
  5. 5.The 2nd of a month is a Wednesday. What day is the 18th of the same month? (a) Thursday (b) Friday (c) Monday (d) Saturday
  6. 6.9 × 10 =
  7. 7.The ages of two twins add up to 18. How old is each twin?
  8. 8.593 × 10 =
  9. 9.Magic square (every row, column and diagonal has the same total): 11 16 9 | 10 12 14 | 15 ? 13. What is the missing number?
  10. 10.Odd one out: which number is NOT in the 5 times table? (a) 24 (b) 40 (c) 35 (d) 20
  11. 11.What comes next? 19, 26, 33, 40, ? (a) 47 (b) 48 (c) 40 (d) 54
  12. 12.9 × 7 = 6? — what is the missing digit?
  13. 13.Take 82 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): ? 7 12 | 13 9 5 | 6 11 10. What is the missing number?
  15. 15.9 × 2 =
  16. 16.8 × 9 =
  17. 17.The 2nd of a month is a Tuesday. What day is the 10th of the same month? (a) Saturday (b) Wednesday (c) Thursday (d) Tuesday
  18. 18.19?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Think of 4. Multiply it by 4, then add 9. What number do you end with?
  20. 20.1 + 2 + 3 + … + 87 =
  21. 21.?906 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.41 × ? = 4100
  23. 23.?367 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  25. 25.Magic trick! Think of 6. Double it, add 18, halve it, then take away 6. What number do you get?
  26. 26.Magic square (every row, column and diagonal has the same total): 5 10 ? | 12 8 4 | 7 6 11. What is the missing number?
  27. 27.I thought of a number, multiplied it by 4 and added 9. I got 21. What was my number?
  28. 28.12345679 × 63 =
  29. 29.37 × 4 =
  30. 30.12345679 × 18 =
  31. 31.Double 22 =
  32. 32.A piggy bank has 12 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  33. 33.Half of 22 =
  34. 34.20 × 4 =
  35. 35.If today is Thursday, what day was it 19 days ago? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
  36. 36.Half of 62 =
  37. 37.Magic square (every row, column and diagonal has the same total): ? 7 22 | 13 19 25 | 16 31 10. What is the missing number?
  38. 38.Double 39 =
  39. 39.1 + 2 + 3 + … + 19 =
  40. 40.9 × 4 = ?6 — what is the missing digit?

Answer key

  1. 72
  2. 0
  3. Monday
  4. 18
  5. Friday
  6. 90
  7. 9
  8. 5930
  9. 8
  10. 24
  11. 47
  12. 3
  13. 72
  14. 8
  15. 18
  16. 72
  17. Wednesday
  18. 9
  19. 25
  20. 3828
  21. 3
  22. 100
  23. 2
  24. 495
  25. 9
  26. 9
  27. 3
  28. 777777777
  29. 148
  30. 222222222
  31. 44
  32. 88
  33. 11
  34. 80
  35. Saturday
  36. 31
  37. 28
  38. 78
  39. 190
  40. 3

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