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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 893 · 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 51 =
  2. 2.1 + 3 + 5 + … + 15 =
  3. 3.The ages of two twins add up to 14. How old is each twin?
  4. 4.A father is 43 years old and his son is 14. How old was the father when the son was born?
  5. 5.9 × 9 = 8? — what is the missing digit?
  6. 6.55 × 100 =
  7. 7.9 × 7 =
  8. 8.12345679 × 27 =
  9. 9.I thought of a number, added 1 and then doubled it. I got 20. What was my number?
  10. 10.10 × 9 =
  11. 11.Double 77 =
  12. 12.9 × 3 = 2? — what is the missing digit?
  13. 13.9 × 8 =
  14. 14.Half of 184 =
  15. 15.I thought of a number, multiplied it by 3 and added 8. I got 29. What was my number?
  16. 16.Magic square (every row, column and diagonal has the same total): 11 16 9 | 10 12 14 | 15 ? 13. What is the missing number?
  17. 17.Odd one out: which number is NOT in the 7 times table? (a) 28 (b) 21 (c) 36 (d) 14
  18. 18.Half of 16 =
  19. 19.3 × 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): 26 11 14 | ? 17 29 | 20 23 8. What is the missing number?
  21. 21.Half of 72 =
  22. 22.Double 53 =
  23. 23.Magic square (every row, column and diagonal has the same total): 5 10 ? | 4 6 8 | 9 2 7. What is the missing number?
  24. 24.9 × 6 = ?4 — what is the missing digit?
  25. 25.123 × 9 + 4 =
  26. 26.I thought of a number, added 8 and then doubled it. I got 32. What was my number?
  27. 27.1 + 3 + 5 + … + 19 =
  28. 28.6 × 1000 =
  29. 29.9 × 8 = 7? — what is the missing digit?
  30. 30.12 × 8 + 2 =
  31. 31.Magic square (every row, column and diagonal has the same total): 19 22 7 | 4 16 28 | 25 ? 13. What is the missing number?
  32. 32.Double 57 =
  33. 33.A piggy bank has 3 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  34. 34.6 × 9 =
  35. 35.A father is 30 years old and his son is 10. How old was the father when the son was born?
  36. 36.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 80 (d) 70
  37. 37.9 × 2 = 1? — what is the missing digit?
  38. 38.?884 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1 + 2 + 3 + … + 87 =
  40. 40.16 × 4 =

Answer key

  1. 102
  2. 64
  3. 7
  4. 29
  5. 1
  6. 5500
  7. 63
  8. 333333333
  9. 9
  10. 90
  11. 154
  12. 7
  13. 72
  14. 92
  15. 7
  16. 8
  17. 36
  18. 8
  19. 27
  20. 5
  21. 36
  22. 106
  23. 3
  24. 5
  25. 1111
  26. 8
  27. 100
  28. 6000
  29. 2
  30. 98
  31. 10
  32. 114
  33. 25
  34. 54
  35. 20
  36. 80
  37. 8
  38. 7
  39. 3828
  40. 64

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