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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 643 · 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.Magic square (every row, column and diagonal has the same total): ? 9 8 | 11 7 3 | 6 5 10. What is the missing number?
  2. 2.9 × 2 =
  3. 3.9 × 5 = ?5 — what is the missing digit?
  4. 4.255 × 10 =
  5. 5.617 × ? = 6170
  6. 6.I thought of a number, added 9 and then doubled it. I got 28. What was my number?
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  8. 8.Odd one out: which number is NOT in the 7 times table? (a) 49 (b) 35 (c) 21 (d) 51
  9. 9.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
  10. 10.Odd one out: which number is NOT in the 6 times table? (a) 48 (b) 24 (c) 30 (d) 57
  11. 11.Take 27 and take away the sum of its digits. What do you get?
  12. 12.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  13. 13.Double 59 =
  14. 14.I thought of a number, multiplied it by 3 and added 3. I got 15. What was my number?
  15. 15.Magic trick! Think of 12. Double it, add 18, halve it, then take away 12. What number do you get?
  16. 16.Double 44 =
  17. 17.9 × 3 = 2? — what is the missing digit?
  18. 18.If today is Thursday, what day will it be after 57 days? (a) Thursday (b) Saturday (c) Monday (d) Friday
  19. 19.214? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.1 + 2 + 3 + … + 14 =
  21. 21.12345678 × 8 + 8 =
  22. 22.64 × 100 =
  23. 23.48 × ? = 48000
  24. 24.9 × 10 = 9? — what is the missing digit?
  25. 25.12345 × 8 + 5 =
  26. 26.693 + 396 =
  27. 27.36 × 1000 =
  28. 28.A father is 34 years old and his son is 5. How old was the father when the son was born?
  29. 29.9 × 3 = ?7 — what is the missing digit?
  30. 30.8 × 9 =
  31. 31.Magic square (every row, column and diagonal has the same total): 8 15 10 | 13 11 9 | ? 7 14. What is the missing number?
  32. 32.37 × 3 =
  33. 33.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 36 (c) 18 (d) 38
  34. 34.111111 × 111111 =
  35. 35.I thought of a number, multiplied it by 4 and added 7. I got 31. What was my number?
  36. 36.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 28 (c) 63 (d) 65
  37. 37.Half of 58 =
  38. 38.30 × ? = 3000
  39. 39.123456 × 8 + 6 =
  40. 40.A father is 44 years old and his son is 6. How old was the father when the son was born?

Answer key

  1. 4
  2. 18
  3. 4
  4. 2550
  5. 10
  6. 5
  7. 693
  8. 51
  9. 3
  10. 57
  11. 18
  12. 3
  13. 118
  14. 4
  15. 9
  16. 88
  17. 7
  18. Friday
  19. 2
  20. 105
  21. 98765432
  22. 6400
  23. 1000
  24. 0
  25. 98765
  26. 1089
  27. 36000
  28. 29
  29. 2
  30. 72
  31. 12
  32. 111
  33. 38
  34. 12345654321
  35. 6
  36. 65
  37. 29
  38. 100
  39. 987654
  40. 38

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