Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 810 · 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.What comes next? 5, 14, 23, 32, ? (a) 50 (b) 42 (c) 32 (d) 41
2. 2.9 × 10 = ?0 — what is the missing digit?
3. 3.Take 600. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.11111 × 11111 =
5. 5.44 × 4 =
6. 6.Do the 1089 trick with 703: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
8. 8.9 × 2 = ?8 — what is the missing digit?
9. 9.Take 49 and take away the sum of its digits. What do you get?
10. 10.Double 73 =
11. 11.If today is Monday, what day will it be after 22 days? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
12. 12.1 × 9 =
13. 13.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 18 12 | ? 6 27. What is the missing number?
14. 14.The 1st of a month is a Wednesday. What day is the 9th of the same month? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
15. 15.9 × 2 =
16. 16.46 × 1000 =
17. 17.9 × 5 =
18. 18.What comes next? 6, 9, 12, 15, ? (a) 18 (b) 19 (c) 21 (d) 15
19. 19.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 15 ? | 24 3 18. What is the missing number?
20. 20.I thought of a number, added 3 and then doubled it. I got 28. What was my number?
21. 21.1111 × 1111 =
22. 22.Do the 1089 trick with 940: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
24. 24.1 + 2 + 3 + … + 53 =
25. 25.123 × 9 + 4 =
26. 26.In 5 years a boy will be 16 years old. How old was he 4 years ago?
27. 27.99 × ? = 9900
28. 28.9 × 5 = 4? — what is the missing digit?
29. 29.Double 69 =
30. 30.6 × 4 =
31. 31.The ages of two twins add up to 26. How old is each twin?
32. 32.I thought of a number, added 7 and then doubled it. I got 24. What was my number?
33. 33.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 42 (d) 36
34. 34.9 × 5 = ?5 — what is the missing digit?
35. 35.9 × 4 = 3? — what is the missing digit?
36. 36.10 × 9 =
37. 37.42 × 100 =
38. 38.9 × 7 = 6? — what is the missing digit?
39. 39.Magic square (every row, column and diagonal has the same total): 8 18 4 | 6 10 ? | 16 2 12. What is the missing number?
40. 40.1 + 2 + 3 + … + 85 =

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