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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 276 · 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. 1.297 + 792 =
  2. 2.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 3 years?
  3. 3.792 + 297 =
  4. 4.7 × 1000 =
  5. 5.Magic square (every row, column and diagonal has the same total): 15 10 ? | 8 12 16 | 13 14 9. What is the missing number?
  6. 6.1 + 2 + 3 + … + 97 =
  7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  8. 8.40 × 100 =
  9. 9.Double 31 =
  10. 10.Half of 186 =
  11. 11.Take 56 and take away the sum of its digits. What do you get?
  12. 12.I thought of a number, added 9 and then doubled it. I got 40. What was my number?
  13. 13.9 × 8 = 7? — what is the missing digit?
  14. 14.A father is 39 years old and his son is 6. How old was the father when the son was born?
  15. 15.15 × 4 =
  16. 16.9 × 5 = ?5 — what is the missing digit?
  17. 17.25 × 4 =
  18. 18.Half of 32 =
  19. 19.I thought of a number, added 2 and then doubled it. I got 44. What was my number?
  20. 20.9 × 9 = 8? — what is the missing digit?
  21. 21.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  22. 22.7 × 4 =
  23. 23.1 + 2 + 3 + … + 98 =
  24. 24.12345679 × 45 =
  25. 25.12 × 8 + 2 =
  26. 26.9 × 4 =
  27. 27.Take 69 and take away the sum of its digits. What do you get?
  28. 28.1 + 3 + 5 + … + 17 =
  29. 29.123 × 9 + 4 =
  30. 30.Take 590. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.I thought of a number, added 1 and then doubled it. I got 20. What was my number?
  32. 32.12 × 4 =
  33. 33.39 × 1000 =
  34. 34.What comes next? 18, 20, 22, 24, ? (a) 24 (b) 27 (c) 26 (d) 28
  35. 35.434? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.1 + 2 + 3 + … + 52 =
  37. 37.14 × 4 =
  38. 38.The ages of two twins add up to 22. How old is each twin?
  39. 39.19 × 1000 =
  40. 40.Double 25 =

Answer key

  1. 1089
  2. 16
  3. 1089
  4. 7000
  5. 11
  6. 4753
  7. 198
  8. 4000
  9. 62
  10. 93
  11. 45
  12. 11
  13. 2
  14. 33
  15. 60
  16. 4
  17. 100
  18. 16
  19. 20
  20. 1
  21. 6
  22. 28
  23. 4851
  24. 555555555
  25. 98
  26. 36
  27. 54
  28. 81
  29. 1111
  30. 495
  31. 9
  32. 48
  33. 39000
  34. 26
  35. 7
  36. 1378
  37. 56
  38. 11
  39. 19000
  40. 50

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