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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 436 · 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.?175 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.9 × 7 = ?3 — what is the missing digit?
  3. 3.Magic trick! Think of 5. Double it, add 12, halve it, then take away 5. What number do you get?
  4. 4.206 × ? = 2060
  5. 5.Take 69 and take away the sum of its digits. What do you get?
  6. 6.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 38 (c) 37 (d) 36
  7. 7.Odd one out: which number is NOT in the 8 times table? (a) 33 (b) 72 (c) 32 (d) 56
  8. 8.?013 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.9 × 8 = 7? — what is the missing digit?
  10. 10.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  11. 11.9 × 3 =
  12. 12.481 × 10 =
  13. 13.Take 56 and take away the sum of its digits. What do you get?
  14. 14.9 × 2 = ?8 — what is the missing digit?
  15. 15.12345679 × 27 =
  16. 16.Magic square (every row, column and diagonal has the same total): 19 ? 31 | 34 22 10 | 13 28 25. What is the missing number?
  17. 17.Magic square (every row, column and diagonal has the same total): 14 7 12 | 9 ? 13 | 10 15 8. What is the missing number?
  18. 18.Take 78 and take away the sum of its digits. What do you get?
  19. 19.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 4 years?
  20. 20.A piggy bank has 11 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  21. 21.Magic square (every row, column and diagonal has the same total): 14 16 6 | ? 12 20 | 18 8 10. What is the missing number?
  22. 22.The ages of two twins add up to 10. How old is each twin?
  23. 23.1 + 2 + 3 + … + 40 =
  24. 24.416 × 10 =
  25. 25.1 + 2 + 3 + … + 73 =
  26. 26.530 × 10 =
  27. 27.I thought of a number, multiplied it by 2 and added 3. I got 9. What was my number?
  28. 28.The 4th of a month is a Wednesday. What day is the 24th of the same month? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  29. 29.47 × 4 =
  30. 30.The 7th of a month is a Sunday. What day is the 25th of the same month? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
  31. 31.27 × 4 =
  32. 32.123456 × 9 + 7 =
  33. 33.Double 43 =
  34. 34.669 × 10 =
  35. 35.A piggy bank has 4 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  36. 36.What comes next? 1, 5, 9, 13, ? (a) 21 (b) 17 (c) 18 (d) 13
  37. 37.25 × 1000 =
  38. 38.9 × 9 =
  39. 39.Half of 62 =
  40. 40.9 × 5 = 4? — what is the missing digit?

Answer key

  1. 5
  2. 6
  3. 6
  4. 10
  5. 54
  6. 36
  7. 33
  8. 5
  9. 2
  10. 29
  11. 27
  12. 4810
  13. 45
  14. 1
  15. 333333333
  16. 16
  17. 11
  18. 63
  19. 13
  20. 85
  21. 4
  22. 5
  23. 820
  24. 4160
  25. 2701
  26. 5300
  27. 3
  28. Tuesday
  29. 188
  30. Thursday
  31. 108
  32. 1111111
  33. 86
  34. 6690
  35. 46
  36. 17
  37. 25000
  38. 81
  39. 31
  40. 5

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