Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 630 · 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. 1.37 × 27 =
2. 2.19 × ? = 1900
3. 3.52 × 4 =
4. 4.9 × 5 = ?5 — what is the missing digit?
5. 5.If today is Sunday, what day will it be after 32 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
6. 6.25 × 4 =
7. 7.1 + 2 + 3 + … + 16 =
8. 8.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 37 (c) 38 (d) 34
9. 9.11 × 11 =
10. 10.21?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.The 5th of a month is a Sunday. What day is the 30th of the same month? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
12. 12.49 × 4 =
13. 13.37 × 18 =
14. 14.Magic square (every row, column and diagonal has the same total): 15 8 13 | ? 12 14 | 11 16 9. What is the missing number?
15. 15.36 × 100 =
16. 16.What comes next? 3, 6, 9, 12, ? (a) 12 (b) 16 (c) 15 (d) 18
17. 17.Do the 1089 trick with 200: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 49 (c) 42 (d) 36
19. 19.If today is Monday, what day was it 23 days ago? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
20. 20.I thought of a number, multiplied it by 2 and added 4. I got 16. What was my number?
21. 21.Magic square (every row, column and diagonal has the same total): 2 7 6 | 9 5 1 | 4 3 ?. What is the missing number?
22. 22.1 + 2 + 3 + … + 10 =
23. 23.Double 12 =
24. 24.2?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.?560 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.In 4 years a boy will be 18 years old. How old was he 7 years ago?
27. 27.2 × 100 =
28. 28.3 × 100 =
29. 29.In 3 years a boy will be 11 years old. How old was he 7 years ago?
30. 30.470 × 10 =
31. 31.Magic square (every row, column and diagonal has the same total): 26 11 14 | 5 17 29 | 20 23 ?. What is the missing number?
32. 32.The 5th of a month is a Friday. What day is the 30th of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
33. 33.9 × 3 = ?7 — what is the missing digit?
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
35. 35.47 × 4 =
36. 36.283 × 10 =
37. 37.5 × 9 =
38. 38.Take 37 and take away the sum of its digits. What do you get?
39. 39.The ages of two twins add up to 12. How old is each twin?
40. 40.1 + 2 + 3 + … + 89 =

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