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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 70 · 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? 9, 14, 19, 24, ? (a) 24 (b) 34 (c) 29 (d) 30
  2. 2.9 × 9 = ?1 — what is the missing digit?
  3. 3.9 × 6 = ?4 — what is the missing digit?
  4. 4.12345678 × 9 + 9 =
  5. 5.12 × 8 + 2 =
  6. 6.2 × 9 =
  7. 7.6?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.Magic square (every row, column and diagonal has the same total): ? 26 16 | 22 18 14 | 20 10 24. What is the missing number?
  9. 9.I thought of a number, multiplied it by 3 and added 9. I got 30. What was my number?
  10. 10.1 + 2 + 3 + … + 42 =
  11. 11.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 80 (d) 81
  12. 12.1 + 3 + 5 + … + 15 =
  13. 13.44?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.243 × 10 =
  15. 15.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 49 (c) 48 (d) 24
  16. 16.9 × 4 = ?6 — what is the missing digit?
  17. 17.123 × 8 + 3 =
  18. 18.63 × 100 =
  19. 19.Take 872. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 83 (c) 81 (d) 79
  21. 21.1 + 2 + 3 + … + 56 =
  22. 22.Odd one out: which number is NOT in the 4 times table? (a) 8 (b) 16 (c) 28 (d) 21
  23. 23.26 × 4 =
  24. 24.Double 17 =
  25. 25.The ages of two twins add up to 16. How old is each twin?
  26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  27. 27.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
  28. 28.Half of 192 =
  29. 29.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 4 years?
  30. 30.Double 93 =
  31. 31.The 8th of a month is a Sunday. What day is the 25th of the same month? (a) Saturday (b) Wednesday (c) Thursday (d) Tuesday
  32. 32.A girl is 7 years old and her brother is 2 years older. How old will her brother be in 2 years?
  33. 33.Take 22 and take away the sum of its digits. What do you get?
  34. 34.Half of 42 =
  35. 35.9 × 1 =
  36. 36.11111 × 11111 =
  37. 37.11 × 4 =
  38. 38.Magic square (every row, column and diagonal has the same total): 12 26 16 | 22 18 14 | ? 10 24. What is the missing number?
  39. 39.40 × ? = 40000
  40. 40.17 × 4 =

Answer key

  1. 29
  2. 8
  3. 5
  4. 111111111
  5. 98
  6. 18
  7. 2
  8. 12
  9. 7
  10. 903
  11. 80
  12. 64
  13. 4
  14. 2430
  15. 49
  16. 3
  17. 987
  18. 6300
  19. 594
  20. 81
  21. 1596
  22. 21
  23. 104
  24. 34
  25. 8
  26. 297
  27. 3
  28. 96
  29. 21
  30. 186
  31. Wednesday
  32. 11
  33. 18
  34. 21
  35. 9
  36. 123454321
  37. 44
  38. 20
  39. 1000
  40. 68

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