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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 551 · 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. 1.9 × 7 = 6? — what is the missing digit?
  2. 2.If today is Tuesday, what day will it be after 80 days? (a) Thursday (b) Saturday (c) Friday (d) Monday
  3. 3.15 × 4 =
  4. 4.?331 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.30 × 4 =
  6. 6.The ages of two twins add up to 12. How old is each twin?
  7. 7.Magic square (every row, column and diagonal has the same total): 12 9 24 | 27 ? 3 | 6 21 18. What is the missing number?
  8. 8.Magic square (every row, column and diagonal has the same total): 17 ? 29 | 32 20 8 | 11 26 23. What is the missing number?
  9. 9.10 × 9 =
  10. 10.Do the 1089 trick with 217: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.Magic trick! Think of 7. Double it, add 8, halve it, then take away 7. What number do you get?
  12. 12.40 × 4 =
  13. 13.A piggy bank has 12 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  14. 14.What comes next? 19, 24, 29, 34, ? (a) 34 (b) 44 (c) 39 (d) 40
  15. 15.The 6th of a month is a Monday. What day is the 19th of the same month? (a) Sunday (b) Saturday (c) Monday (d) Wednesday
  16. 16.Do the 1089 trick with 280: reverse and subtract, then reverse that answer and add. What do you get?
  17. 17.1111 × 1111 =
  18. 18.The 6th of a month is a Sunday. What day is the 21st of the same month? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
  19. 19.9 × 9 =
  20. 20.9 × 6 = ?4 — what is the missing digit?
  21. 21.12345679 × 54 =
  22. 22.9 × 3 =
  23. 23.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 17 (d) 16
  24. 24.9 × 2 = ?8 — what is the missing digit?
  25. 25.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 ? 12 | 21 6 27. What is the missing number?
  26. 26.9 × 7 = ?3 — what is the missing digit?
  27. 27.28 × 1000 =
  28. 28.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 79 (d) 81
  29. 29.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 12 10 | 13 ? 15. What is the missing number?
  30. 30.Double 44 =
  31. 31.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 10 ?. What is the missing number?
  32. 32.47 × 4 =
  33. 33.A father is 33 years old and his son is 12. How old was the father when the son was born?
  34. 34.?230 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.Take 961. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  36. 36.Half of 38 =
  37. 37.194 × 10 =
  38. 38.Take 33 and take away the sum of its digits. What do you get?
  39. 39.What comes next? 36, 49, 64, 81, ? (a) 102 (b) 101 (c) 100 (d) 98
  40. 40.Think of 6. Multiply it by 2, then add 3. What number do you end with?

Answer key

  1. 3
  2. Friday
  3. 60
  4. 2
  5. 120
  6. 6
  7. 15
  8. 14
  9. 90
  10. 1089
  11. 4
  12. 160
  13. 88
  14. 39
  15. Sunday
  16. 1089
  17. 1234321
  18. Monday
  19. 81
  20. 5
  21. 666666666
  22. 27
  23. 16
  24. 1
  25. 18
  26. 6
  27. 28000
  28. 81
  29. 8
  30. 88
  31. 3
  32. 188
  33. 21
  34. 4
  35. 792
  36. 19
  37. 1940
  38. 27
  39. 100
  40. 15

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