Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 886 · 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.?575 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.46 × 4 =
3. 3.Double 78 =
4. 4.Half of 132 =
5. 5.73?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Magic square (every row, column and diagonal has the same total): 5 4 9 | 10 6 ? | 3 8 7. What is the missing number?
7. 7.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 37 (c) 38 (d) 36
8. 8.Magic square (every row, column and diagonal has the same total): 13 34 19 | ? 22 16 | 25 10 31. What is the missing number?
9. 9.If today is Friday, what day will it be after 47 days? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
10. 10.39 × 4 =
11. 11.9 × 5 = 4? — what is the missing digit?
12. 12.Think of 8. Multiply it by 4, then add 1. What number do you end with?
13. 13.35 × 1000 =
14. 14.Take 460. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.Half of 88 =
17. 17.9 × 8 = ?2 — what is the missing digit?
18. 18.Half of 38 =
19. 19.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 7 years?
20. 20.1 + 3 + 5 + … + 21 =
21. 21.Magic square (every row, column and diagonal has the same total): 24 3 ? | 9 15 21 | 12 27 6. What is the missing number?
22. 22.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 98 (d) 102
23. 23.1 + 2 + 3 + … + 88 =
24. 24.9 × 6 = 5? — what is the missing digit?
25. 25.12345678 × 8 + 8 =
26. 26.9 × 3 =
27. 27.Magic square (every row, column and diagonal has the same total): 21 6 27 | 24 18 12 | ? 30 15. What is the missing number?
28. 28.12345679 × 54 =
29. 29.27 × 4 =
30. 30.In 3 years a boy will be 13 years old. How old was he 7 years ago?
31. 31.12345679 × 9 =
32. 32.1 + 3 + 5 + … + 11 =
33. 33.9 × 9 = 8? — what is the missing digit?
34. 34.Magic square (every row, column and diagonal has the same total): 14 24 10 | ? 16 20 | 22 8 18. What is the missing number?
35. 35.2?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.9 × 10 = ?0 — what is the missing digit?
37. 37.Double 75 =
38. 38.483 × 10 =
39. 39.In 6 years a boy will be 19 years old. How old was he 4 years ago?
40. 40.633 × ? = 6330

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