Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 997 · 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. 1.9 × 3 =
2. 2.9 × 9 =
3. 3.Half of 92 =
4. 4.Half of 142 =
5. 5.Take 936. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Do the 1089 trick with 479: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.9 × 8 = ?2 — what is the missing digit?
8. 8.25 × 4 =
9. 9.84 × 100 =
10. 10.Magic square (every row, column and diagonal has the same total): 22 12 14 | 8 ? 24 | 18 20 10. What is the missing number?
11. 11.6 × 9 =
12. 12.150 × ? = 1500
13. 13.6 × 4 =
14. 14.If today is Thursday, what day will it be after 41 days? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
15. 15.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 66 (d) 64
16. 16.1 + 2 + 3 + … + 91 =
17. 17.Magic trick! Think of 14. Double it, add 16, halve it, then take away 14. What number do you get?
18. 18.Magic square (every row, column and diagonal has the same total): 14 35 ? | 29 23 17 | 26 11 32. What is the missing number?
19. 19.9 × 6 = ?4 — what is the missing digit?
20. 20.Take 169. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.12345679 × 54 =
22. 22.9 × 3 = 2? — what is the missing digit?
23. 23.If today is Friday, what day will it be after 17 days? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
24. 24.61 × ? = 6100
25. 25.37 × 12 =
26. 26.12 × 4 =
27. 27.Odd one out: which number is NOT in the 5 times table? (a) 30 (b) 35 (c) 20 (d) 21
28. 28.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 4 years?
29. 29.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 3 years?
30. 30.9 × 6 =
31. 31.54 × 4 =
32. 32.55 × 4 =
33. 33.Magic square (every row, column and diagonal has the same total): 32 17 20 | 11 ? 35 | 26 29 14. What is the missing number?
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
35. 35.46 × 4 =
36. 36.19 × ? = 19000
37. 37.Magic trick! Think of 19. Double it, add 16, halve it, then take away 19. What number do you get?
38. 38.1 + 2 + 3 + … + 32 =
39. 39.39 × 4 =
40. 40.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 60 (d) 80

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