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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 738 · 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): 25 ? 13 | 10 22 34 | 31 16 19. What is the missing number?
  2. 2.37 × 3 =
  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. 4.1 + 2 + 3 + … + 25 =
  5. 5.9 × 7 =
  6. 6.Double 49 =
  7. 7.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 5 years?
  8. 8.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.What comes next? 3, 10, 17, 24, ? (a) 31 (b) 32 (c) 38 (d) 24
  10. 10.Take 169. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.84 × ? = 8400
  12. 12.The ages of two twins add up to 30. How old is each twin?
  13. 13.297 + 792 =
  14. 14.9 × 9 =
  15. 15.32 × 100 =
  16. 16.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 36 (c) 48 (d) 49
  17. 17.I thought of a number, added 5 and then doubled it. I got 30. What was my number?
  18. 18.44 × ? = 44000
  19. 19.Half of 74 =
  20. 20.What comes next? 7, 12, 17, 22, ? (a) 22 (b) 27 (c) 28 (d) 32
  21. 21.9 × 3 =
  22. 22.12345679 × 18 =
  23. 23.7 × 9 =
  24. 24.1 + 2 + 3 + … + 32 =
  25. 25.9 × 10 = ?0 — what is the missing digit?
  26. 26.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
  27. 27.9 × 5 = ?5 — what is the missing digit?
  28. 28.9 × 2 =
  29. 29.334? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.9 × 6 = 5? — what is the missing digit?
  31. 31.A father is 37 years old and his son is 13. How old was the father when the son was born?
  32. 32.Take 50 and take away the sum of its digits. What do you get?
  33. 33.1 + 3 + 5 + … + 27 =
  34. 34.Magic trick! Think of 14. Double it, add 10, halve it, then take away 14. What number do you get?
  35. 35.6?25 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Magic trick! Think of 7. Double it, add 10, halve it, then take away 7. What number do you get?
  37. 37.1 + 2 + 3 + … + 84 =
  38. 38.12345679 × 27 =
  39. 39.59 × 4 =
  40. 40.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 100 (c) 101 (d) 102

Answer key

  1. 28
  2. 111
  3. 15
  4. 325
  5. 63
  6. 98
  7. 17
  8. 1089
  9. 31
  10. 792
  11. 100
  12. 15
  13. 1089
  14. 81
  15. 3200
  16. 48
  17. 10
  18. 1000
  19. 37
  20. 27
  21. 27
  22. 222222222
  23. 63
  24. 528
  25. 9
  26. 1
  27. 4
  28. 18
  29. 8
  30. 4
  31. 24
  32. 45
  33. 196
  34. 5
  35. 5
  36. 5
  37. 3570
  38. 333333333
  39. 236
  40. 100

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