Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 195 · 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.Half of 62 =
2. 2.318 × ? = 3180
3. 3.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 60 (d) 80
4. 4.1 + 2 + 3 + … + 11 =
5. 5.43 × 1000 =
6. 6.1 + 3 + 5 + … + 19 =
7. 7.1234 × 9 + 5 =
8. 8.9 × 9 =
9. 9.897 × 10 =
10. 10.Magic square (every row, column and diagonal has the same total): 3 10 5 | 8 6 4 | 7 2 ?. What is the missing number?
11. 11.The 1st of a month is a Sunday. What day is the 10th of the same month? (a) Monday (b) Friday (c) Tuesday (d) Wednesday
12. 12.42 × 4 =
13. 13.9 × 9 = ?1 — what is the missing digit?
14. 14.I thought of a number, added 7 and then doubled it. I got 40. What was my number?
15. 15.Double 23 =
16. 16.The 1st of a month is a Tuesday. What day is the 21st of the same month? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
18. 18.1 × 9 =
19. 19.The 1st of a month is a Thursday. What day is the 22nd of the same month? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
20. 20.9 × 1 =
21. 21.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 81 (c) 79 (d) 82
22. 22.9 × 8 =
23. 23.The ages of two twins add up to 14. How old is each twin?
24. 24.1 + 3 + 5 + … + 17 =
25. 25.Half of 162 =
26. 26.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 19 27 | ? 15 17. What is the missing number?
27. 27.1 + 2 + 3 + … + 65 =
28. 28.29 × 4 =
29. 29.9 × 3 = 2? — what is the missing digit?
30. 30.Take 840. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.1 + 2 + 3 + … + 66 =
32. 32.70 × 100 =
33. 33.9 × 2 = ?8 — what is the missing digit?
34. 34.Take 397. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.9 × 3 = ?7 — what is the missing digit?
36. 36.Magic square (every row, column and diagonal has the same total): 16 11 12 | 9 ? 17 | 14 15 10. What is the missing number?
37. 37.Magic trick! Think of 14. Double it, add 18, halve it, then take away 14. What number do you get?
38. 38.I thought of a number, added 2 and then doubled it. I got 20. What was my number?
39. 39.Magic square (every row, column and diagonal has the same total): 16 26 ? | 14 18 22 | 24 10 20. What is the missing number?
40. 40.1?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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