Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 555 · 40 questions

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.

1. 1.662 × ? = 6620
2. 2.I thought of a number, added 2 and then doubled it. I got 44. What was my number?
3. 3.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 9 years?
4. 4.111 × 111 =
5. 5.11 × 11 =
6. 6.37 × 1000 =
7. 7.35 × 100 =
8. 8.9 × 7 = ?3 — what is the missing digit?
9. 9.12345679 × 72 =
10. 10.Odd one out: which number is NOT in the 6 times table? (a) 21 (b) 48 (c) 36 (d) 18
11. 11.878 × 10 =
12. 12.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 12 (c) 13 (d) 16
13. 13.Do the 1089 trick with 189: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.70? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.9 × 10 =
16. 16.9 × 4 = 3? — what is the missing digit?
17. 17.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 60 (d) 70
18. 18.The 1st of a month is a Sunday. What day is the 17th of the same month? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
19. 19.Magic trick! Think of 18. Double it, add 18, halve it, then take away 18. What number do you get?
20. 20.If today is Wednesday, what day will it be after 25 days? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
21. 21.297 + 792 =
22. 22.Think of 2. Multiply it by 2, then add 4. What number do you end with?
23. 23.1 × 9 =
24. 24.832 × 10 =
25. 25.The 7th of a month is a Tuesday. What day is the 30th of the same month? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
26. 26.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 47 (c) 51 (d) 49
27. 27.?011 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Magic square (every row, column and diagonal has the same total): 8 18 16 | 22 14 ? | 12 10 20. What is the missing number?
29. 29.9 × 3 =
30. 30.The 7th of a month is a Thursday. What day is the 15th of the same month? (a) Monday (b) Thursday (c) Friday (d) Saturday
31. 31.If today is Wednesday, what day was it 20 days ago? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
32. 32.Think of 15. Multiply it by 5, then add 1. What number do you end with?
33. 33.Magic square (every row, column and diagonal has the same total): 8 ? 10 | 13 11 9 | 12 7 14. What is the missing number?
34. 34.9 × 6 =
35. 35.If today is Thursday, what day will it be after 29 days? (a) Thursday (b) Monday (c) Saturday (d) Friday
36. 36.Magic trick! Think of 12. Double it, add 16, halve it, then take away 12. What number do you get?
37. 37.In 5 years a boy will be 19 years old. How old was he 3 years ago?
38. 38.2 × 9 =
39. 39.90 × ? = 9000
40. 40.Magic trick! Think of 8. Double it, add 4, halve it, then take away 8. What number do you get?

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