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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 732 · 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): ? 3 8 | 9 5 1 | 2 7 6. What is the missing number?
  2. 2.What comes next? 11, 17, 23, 29, ? (a) 41 (b) 29 (c) 35 (d) 36
  3. 3.Magic square (every row, column and diagonal has the same total): 17 27 13 | ? 19 23 | 25 11 21. What is the missing number?
  4. 4.9 × 3 = ?7 — what is the missing digit?
  5. 5.I thought of a number, multiplied it by 5 and added 1. I got 61. What was my number?
  6. 6.Take 38 and take away the sum of its digits. What do you get?
  7. 7.9 × 10 = 9? — what is the missing digit?
  8. 8.9 × 9 = ?1 — what is the missing digit?
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  10. 10.I thought of a number, added 3 and then doubled it. I got 28. What was my number?
  11. 11.Take 98 and take away the sum of its digits. What do you get?
  12. 12.1 + 2 + 3 + … + 95 =
  13. 13.17 × 1000 =
  14. 14.1 + 2 + 3 + … + 53 =
  15. 15.54?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.111 × 111 =
  17. 17.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 11 15 | 12 13 ?. What is the missing number?
  18. 18.37 × 3 =
  19. 19.9 × 7 = 6? — what is the missing digit?
  20. 20.1 + 3 + 5 + … + 21 =
  21. 21.Double 29 =
  22. 22.33 × ? = 33000
  23. 23.A father is 30 years old and his son is 10. How old was the father when the son was born?
  24. 24.3?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.Magic square (every row, column and diagonal has the same total): 18 ? 12 | 15 21 27 | 30 9 24. What is the missing number?
  26. 26.Think of 10. Multiply it by 2, then add 3. What number do you end with?
  27. 27.396 + 693 =
  28. 28.I thought of a number, added 2 and then doubled it. I got 26. What was my number?
  29. 29.In 2 years a boy will be 10 years old. How old was he 7 years ago?
  30. 30.Take 65 and take away the sum of its digits. What do you get?
  31. 31.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 19 13 | 10 31 ?. What is the missing number?
  32. 32.A piggy bank has 12 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  33. 33.37 × 9 =
  34. 34.45 × 4 =
  35. 35.33 × 4 =
  36. 36.9 × 4 =
  37. 37.Take 805. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.44 × 4 =
  39. 39.9 × 5 = ?5 — what is the missing digit?
  40. 40.7 × 4 =

Answer key

  1. 4
  2. 35
  3. 15
  4. 2
  5. 12
  6. 27
  7. 0
  8. 8
  9. 594
  10. 11
  11. 81
  12. 4560
  13. 17000
  14. 1431
  15. 4
  16. 12321
  17. 8
  18. 111
  19. 3
  20. 121
  21. 58
  22. 1000
  23. 20
  24. 7
  25. 33
  26. 23
  27. 1089
  28. 11
  29. 1
  30. 54
  31. 16
  32. 66
  33. 333
  34. 180
  35. 132
  36. 36
  37. 297
  38. 176
  39. 4
  40. 28

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