Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 829 · 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.Take 679. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.Magic square (every row, column and diagonal has the same total): 20 35 14 | 17 ? 29 | 32 11 26. What is the missing number?
3. 3.1234567 × 9 + 8 =
4. 4.21 × 4 =
5. 5.1 + 3 + 5 + … + 17 =
6. 6.9 × 10 = 9? — what is the missing digit?
7. 7.Magic square (every row, column and diagonal has the same total): ? 18 8 | 14 10 6 | 12 2 16. What is the missing number?
8. 8.12345679 × 18 =
9. 9.26 × 4 =
10. 10.9 × 5 = 4? — what is the missing digit?
11. 11.46 × 4 =
12. 12.Do the 1089 trick with 630: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 8 years?
14. 14.1 + 2 + 3 + … + 17 =
15. 15.9 × 4 = 3? — what is the missing digit?
16. 16.9 × 1 =
17. 17.12345679 × 36 =
18. 18.Do the 1089 trick with 133: reverse and subtract, then reverse that answer and add. What do you get?
19. 19.Magic square (every row, column and diagonal has the same total): 9 ? 13 | 14 10 6 | 7 12 11. What is the missing number?
20. 20.If today is Friday, what day was it 57 days ago? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
21. 21.1 + 2 + 3 + … + 96 =
22. 22.Magic square (every row, column and diagonal has the same total): 12 7 14 | 13 11 ? | 8 15 10. What is the missing number?
23. 23.I thought of a number, added 6 and then doubled it. I got 36. What was my number?
24. 24.9 × 3 = 2? — what is the missing digit?
25. 25.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 51 (c) 47 (d) 50
26. 26.1 + 3 + 5 + … + 45 =
27. 27.9 × 4 =
28. 28.Magic square (every row, column and diagonal has the same total): 23 9 19 | 13 17 21 | 15 ? 11. What is the missing number?
29. 29.9 × 7 = ?3 — what is the missing digit?
30. 30.Take 950. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.6 × 9 =
32. 32.Magic square (every row, column and diagonal has the same total): 7 6 11 | 12 8 4 | 5 ? 9. What is the missing number?
33. 33.Double 26 =
34. 34.Half of 192 =
35. 35.The 4th of a month is a Tuesday. What day is the 18th of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
36. 36.9 × 3 =
37. 37.Do the 1089 trick with 481: reverse and subtract, then reverse that answer and add. What do you get?
38. 38.1 × 9 =
39. 39.1 + 2 + 3 + … + 15 =
40. 40.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25

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