Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 851 · 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 × 6 =
2. 2.12345679 × 9 =
3. 3.495 + 594 =
4. 4.19 × 10 =
5. 5.4 × 9 =
6. 6.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 27 (c) 26 (d) 23
7. 7.5 × 9 =
8. 8.Magic square (every row, column and diagonal has the same total): 13 23 9 | 11 15 19 | 21 7 ?. What is the missing number?
9. 9.The 8th of a month is a Tuesday. What day is the 18th of the same month? (a) Monday (b) Thursday (c) Friday (d) Saturday
10. 10.12345679 × 54 =
11. 11.23 × 4 =
12. 12.Double 77 =
13. 13.9 × 4 = 3? — what is the missing digit?
14. 14.55 × 4 =
15. 15.9 × 7 =
16. 16.If today is Wednesday, what day will it be after 63 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
17. 17.21 × 4 =
18. 18.In 2 years a boy will be 10 years old. How old was he 4 years ago?
19. 19.334 × 10 =
20. 20.1 + 2 + 3 + … + 72 =
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
23. 23.Double 12 =
24. 24.Magic square (every row, column and diagonal has the same total): 10 ? 22 | 31 19 7 | 16 13 28. What is the missing number?
25. 25.Magic square (every row, column and diagonal has the same total): 15 17 ? | 5 13 21 | 19 9 11. What is the missing number?
26. 26.9 × 3 = 2? — what is the missing digit?
27. 27.If today is Thursday, what day was it 22 days ago? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
28. 28.734 × 10 =
29. 29.Double 64 =
30. 30.Magic trick! Think of 2. Double it, add 16, halve it, then take away 2. What number do you get?
31. 31.9 × 9 = ?1 — what is the missing digit?
32. 32.9 × 6 = 5? — what is the missing digit?
33. 33.Think of 4. Multiply it by 2, then add 7. What number do you end with?
34. 34.Magic square (every row, column and diagonal has the same total): ? 21 18 | 27 15 3 | 12 9 24. What is the missing number?
35. 35.Magic square (every row, column and diagonal has the same total): 14 24 10 | ? 16 20 | 22 8 18. What is the missing number?
36. 36.155 × ? = 1550
37. 37.30 × ? = 30000
38. 38.Magic square (every row, column and diagonal has the same total): 13 10 25 | 28 16 4 | 7 ? 19. What is the missing number?
39. 39.?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.What comes next? 11, 16, 21, 26, ? (a) 36 (b) 31 (c) 32 (d) 26

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