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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 653 · 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.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 18 (c) 78 (d) 36
  2. 2.I thought of a number, added 9 and then doubled it. I got 24. What was my number?
  3. 3.32 × ? = 3200
  4. 4.9 × 4 = ?6 — what is the missing digit?
  5. 5.2?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.9 × 5 =
  7. 7.40 × 4 =
  8. 8.9 × 8 = 7? — what is the missing digit?
  9. 9.1 + 3 + 5 + … + 33 =
  10. 10.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 3 years?
  11. 11.Magic trick! Think of 6. Double it, add 14, halve it, then take away 6. What number do you get?
  12. 12.5 × 9 =
  13. 13.307 × ? = 3070
  14. 14.46 × 4 =
  15. 15.9 × 9 =
  16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  17. 17.9 × 10 =
  18. 18.The 4th of a month is a Monday. What day is the 13th of the same month? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  19. 19.11 × 11 =
  20. 20.2 × 9 =
  21. 21.9 × 3 = 2? — what is the missing digit?
  22. 22.A piggy bank has 12 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  23. 23.If today is Saturday, what day was it 22 days ago? (a) Thursday (b) Friday (c) Saturday (d) Monday
  24. 24.396 + 693 =
  25. 25.78 × ? = 780
  26. 26.Magic square (every row, column and diagonal has the same total): 8 3 ? | 9 7 5 | 4 11 6. What is the missing number?
  27. 27.Magic square (every row, column and diagonal has the same total): 7 22 19 | 28 16 4 | 13 ? 25. What is the missing number?
  28. 28.Magic trick! Think of 7. Double it, add 4, halve it, then take away 7. What number do you get?
  29. 29.12345679 × 18 =
  30. 30.123 × 9 + 4 =
  31. 31.13 × 4 =
  32. 32.The ages of two twins add up to 14. How old is each twin?
  33. 33.Take 58 and take away the sum of its digits. What do you get?
  34. 34.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 20 (c) 40 (d) 47
  35. 35.83 × ? = 8300
  36. 36.19 × 1000 =
  37. 37.9 × ? = 900
  38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  39. 39.42 × 4 =
  40. 40.1 × 9 =

Answer key

  1. 78
  2. 3
  3. 100
  4. 3
  5. 5
  6. 45
  7. 160
  8. 2
  9. 289
  10. 14
  11. 7
  12. 45
  13. 10
  14. 184
  15. 81
  16. 495
  17. 90
  18. Wednesday
  19. 121
  20. 18
  21. 7
  22. 78
  23. Friday
  24. 1089
  25. 10
  26. 10
  27. 10
  28. 2
  29. 222222222
  30. 1111
  31. 52
  32. 7
  33. 45
  34. 47
  35. 100
  36. 19000
  37. 100
  38. 198
  39. 168
  40. 9

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