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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 274 · 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.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 36 (c) 38 (d) 37
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  3. 3.94? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.Magic square (every row, column and diagonal has the same total): 4 3 ? | 9 5 1 | 2 7 6. What is the missing number?
  5. 5.3?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.12345679 × 27 =
  7. 7.If today is Thursday, what day was it 32 days ago? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  8. 8.9 × 10 =
  9. 9.The 5th of a month is a Sunday. What day is the 14th of the same month? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  10. 10.Take 703. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.Take 79 and take away the sum of its digits. What do you get?
  12. 12.12 × 9 + 3 =
  13. 13.9 × 2 = ?8 — what is the missing digit?
  14. 14.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 12 ? | 10 20 6. What is the missing number?
  15. 15.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 7 years?
  16. 16.Think of 14. Multiply it by 4, then add 5. What number do you end with?
  17. 17.Magic trick! Think of 18. Double it, add 4, halve it, then take away 18. What number do you get?
  18. 18.1 + 2 + 3 + … + 79 =
  19. 19.I thought of a number, added 4 and then doubled it. I got 32. What was my number?
  20. 20.9 × 4 = 3? — what is the missing digit?
  21. 21.Magic square (every row, column and diagonal has the same total): 16 2 12 | 6 10 14 | ? 18 4. What is the missing number?
  22. 22.1 + 3 + 5 + … + 39 =
  23. 23.76 × 100 =
  24. 24.Half of 48 =
  25. 25.I thought of a number, added 8 and then doubled it. I got 30. What was my number?
  26. 26.The 9th of a month is a Thursday. What day is the 30th of the same month? (a) Sunday (b) Wednesday (c) Thursday (d) Friday
  27. 27.The ages of two twins add up to 14. How old is each twin?
  28. 28.1 + 2 + 3 + … + 55 =
  29. 29.12345 × 8 + 5 =
  30. 30.1 + 2 + 3 + … + 16 =
  31. 31.11111 × 11111 =
  32. 32.7 × 100 =
  33. 33.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  34. 34.12 × 1000 =
  35. 35.72 × 100 =
  36. 36.9 × 9 = ?1 — what is the missing digit?
  37. 37.Half of 94 =
  38. 38.20?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.9 × 5 =
  40. 40.15 × 4 =

Answer key

  1. 36
  2. 198
  3. 5
  4. 8
  5. 1
  6. 333333333
  7. Sunday
  8. 90
  9. Tuesday
  10. 396
  11. 63
  12. 111
  13. 1
  14. 16
  15. 25
  16. 61
  17. 2
  18. 3160
  19. 12
  20. 6
  21. 8
  22. 400
  23. 7600
  24. 24
  25. 7
  26. Thursday
  27. 7
  28. 1540
  29. 98765
  30. 136
  31. 123454321
  32. 700
  33. 1
  34. 12000
  35. 7200
  36. 8
  37. 47
  38. 3
  39. 45
  40. 60

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