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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 183 · 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 92 =
  2. 2.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 27 (c) 26 (d) 23
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.Magic square (every row, column and diagonal has the same total): 7 ? 5 | 6 8 10 | 11 4 9. What is the missing number?
  5. 5.9 × 3 =
  6. 6.26 × 4 =
  7. 7.1 + 2 + 3 + … + 56 =
  8. 8.9 × 7 = ?3 — what is the missing digit?
  9. 9.Think of 8. Multiply it by 2, then add 5. What number do you end with?
  10. 10.9 × 9 =
  11. 11.Double 26 =
  12. 12.81 × 100 =
  13. 13.What comes next? 12, 18, 24, 30, ? (a) 36 (b) 37 (c) 42 (d) 30
  14. 14.9 × 3 = 2? — what is the missing digit?
  15. 15.In 2 years a boy will be 14 years old. How old was he 4 years ago?
  16. 16.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 5 years?
  17. 17.12345679 × 72 =
  18. 18.?781 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.The 9th of a month is a Monday. What day is the 29th of the same month? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  21. 21.12345679 × 9 =
  22. 22.5 × 9 =
  23. 23.Take 34 and take away the sum of its digits. What do you get?
  24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  25. 25.I thought of a number, added 4 and then doubled it. I got 40. What was my number?
  26. 26.9 × 10 = ?0 — what is the missing digit?
  27. 27.A piggy bank has 7 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  28. 28.1 + 3 + 5 + … + 9 =
  29. 29.?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  31. 31.18 × 4 =
  32. 32.Magic square (every row, column and diagonal has the same total): 13 28 7 | 10 16 22 | 25 ? 19. What is the missing number?
  33. 33.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 62 (c) 64 (d) 65
  34. 34.Double 11 =
  35. 35.The ages of two twins add up to 10. How old is each twin?
  36. 36.Magic square (every row, column and diagonal has the same total): 16 2 12 | ? 10 14 | 8 18 4. What is the missing number?
  37. 37.I thought of a number, multiplied it by 4 and added 1. I got 61. What was my number?
  38. 38.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
  39. 39.34 × 1000 =
  40. 40.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?

Answer key

  1. 184
  2. 25
  3. 3
  4. 12
  5. 27
  6. 104
  7. 1596
  8. 6
  9. 21
  10. 81
  11. 52
  12. 8100
  13. 36
  14. 7
  15. 8
  16. 21
  17. 888888888
  18. 2
  19. 1
  20. Sunday
  21. 111111111
  22. 45
  23. 27
  24. 693
  25. 16
  26. 9
  27. 61
  28. 25
  29. 6
  30. 792
  31. 72
  32. 4
  33. 64
  34. 22
  35. 5
  36. 6
  37. 15
  38. 3
  39. 34000
  40. 29

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