Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 983 · 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. 1.776? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.What comes next? 6, 8, 10, 12, ? (a) 15 (b) 12 (c) 14 (d) 16
3. 3.If today is Sunday, what day was it 54 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
4. 4.The 8th of a month is a Saturday. What day is the 16th of the same month? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
5. 5.662 × 10 =
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
7. 7.1 + 3 + 5 + … + 45 =
8. 8.5 × 10 =
9. 9.Take 992. Reverse its digits and take the smaller number away from the bigger one. What do you get?
10. 10.11111 × 11111 =
11. 11.The 6th of a month is a Thursday. What day is the 20th of the same month? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
12. 12.Take 32 and take away the sum of its digits. What do you get?
13. 13.10 × 9 =
14. 14.89 × ? = 8900
15. 15.What comes next? 25, 36, 49, 64, ? (a) 79 (b) 82 (c) 81 (d) 83
16. 16.37 × 21 =
17. 17.Think of 5. Multiply it by 3, then add 4. What number do you end with?
18. 18.Take 19 and take away the sum of its digits. What do you get?
19. 19.I thought of a number, added 5 and then doubled it. I got 30. What was my number?
20. 20.What comes next? 15, 22, 29, 36, ? (a) 50 (b) 43 (c) 44 (d) 36
21. 21.1 + 3 + 5 + … + 37 =
22. 22.Take 43 and take away the sum of its digits. What do you get?
23. 23.Take 73 and take away the sum of its digits. What do you get?
24. 24.In 2 years a boy will be 12 years old. How old was he 3 years ago?
25. 25.Half of 82 =
26. 26.28 × 4 =
27. 27.891 + 198 =
28. 28.1 + 2 + 3 + … + 38 =
29. 29.If today is Saturday, what day will it be after 45 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
30. 30.9 × 2 = ?8 — what is the missing digit?
31. 31.198 + 891 =
32. 32.9 × 2 =
33. 33.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.3 × 9 =
35. 35.284 × ? = 2840
36. 36.16 × 4 =
37. 37.Magic square (every row, column and diagonal has the same total): 21 6 27 | 24 ? 12 | 9 30 15. What is the missing number?
38. 38.9 × 6 = ?4 — what is the missing digit?
39. 39.29 × ? = 2900
40. 40.Magic trick! Think of 6. Double it, add 12, halve it, then take away 6. What number do you get?

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