Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 148 · 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. 1.11111 × 11111 =
2. 2.55 × 4 =
3. 3.49 × 1000 =
4. 4.Odd one out: which number is NOT in the 9 times table? (a) 54 (b) 88 (c) 27 (d) 18
5. 5.1 + 3 + 5 + … + 35 =
6. 6.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 ? | 13 3 17. What is the missing number?
7. 7.1 + 2 + 3 + … + 40 =
8. 8.9 × 3 = 2? — what is the missing digit?
9. 9.Magic square (every row, column and diagonal has the same total): 16 31 10 | ? 19 25 | 28 7 22. What is the missing number?
10. 10.123456 × 8 + 6 =
11. 11.Double 63 =
12. 12.Take 22 and take away the sum of its digits. What do you get?
13. 13.47 × 4 =
14. 14.Double 37 =
15. 15.37 × 9 =
16. 16.Double 78 =
17. 17.Magic square (every row, column and diagonal has the same total): ? 27 6 | 9 15 21 | 24 3 18. What is the missing number?
18. 18.9 × 8 = ?2 — what is the missing digit?
19. 19.37 × 3 =
20. 20.I thought of a number, multiplied it by 4 and added 9. I got 17. What was my number?
21. 21.17 × ? = 1700
22. 22.8 × 9 =
23. 23.The 8th of a month is a Wednesday. What day is the 30th of the same month? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
24. 24.Magic square (every row, column and diagonal has the same total): 22 7 ? | 25 19 13 | 10 31 16. What is the missing number?
25. 25.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 82 (c) 79 (d) 83
26. 26.30 × 4 =
27. 27.Magic trick! Think of 14. Double it, add 10, halve it, then take away 14. What number do you get?
28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
29. 29.Double 26 =
30. 30.1 + 2 + 3 + … + 53 =
31. 31.Do the 1089 trick with 950: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.If today is Sunday, what day will it be after 47 days? (a) Monday (b) Thursday (c) Friday (d) Saturday
33. 33.1 + 3 + 5 + … + 13 =
34. 34.123 × 9 + 4 =
35. 35.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 62 (c) 64 (d) 65
36. 36.If today is Saturday, what day will it be after 98 days? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
37. 37.1 + 3 + 5 + … + 27 =
38. 38.12345679 × 45 =
39. 39.2 × ? = 20
40. 40.9 × 6 = ?4 — what is the missing digit?

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