Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 933 · 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. 1.37 × 12 =
2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
3. 3.9 × 2 =
4. 4.9 × 3 = ?7 — what is the missing digit?
5. 5.12 × 9 + 3 =
6. 6.824? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.2 × ? = 2000
8. 8.Double 32 =
9. 9.57 × 4 =
10. 10.The 1st of a month is a Friday. What day is the 30th of the same month? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
11. 11.1 + 2 + 3 + … + 6 =
12. 12.The 4th of a month is a Sunday. What day is the 23rd of the same month? (a) Monday (b) Saturday (c) Thursday (d) Friday
13. 13.123456 × 8 + 6 =
14. 14.Half of 52 =
15. 15.297 + 792 =
16. 16.47? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.9 × 6 = 5? — what is the missing digit?
18. 18.10 × 9 =
19. 19.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 38 (d) 34
20. 20.9 × 5 = ?5 — what is the missing digit?
21. 21.1 + 2 + 3 + … + 49 =
22. 22.40 × ? = 4000
23. 23.Do the 1089 trick with 996: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.31 × ? = 31000
25. 25.Do the 1089 trick with 712: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.8 × 1000 =
27. 27.1 × 9 =
28. 28.1 + 2 + 3 + … + 14 =
29. 29.Take 58 and take away the sum of its digits. What do you get?
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
31. 31.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 11 (c) 9 (d) 6
32. 32.Take 93 and take away the sum of its digits. What do you get?
33. 33.Magic square (every row, column and diagonal has the same total): 16 11 12 | ? 13 17 | 14 15 10. What is the missing number?
34. 34.9 × 9 =
35. 35.952 × 10 =
36. 36.1 + 2 + 3 + … + 84 =
37. 37.The 1st of a month is a Saturday. What day is the 28th of the same month? (a) Thursday (b) Monday (c) Saturday (d) Friday
38. 38.If today is Wednesday, what day was it 19 days ago? (a) Friday (b) Saturday (c) Monday (d) Thursday
39. 39.1?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Half of 168 =

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