Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 968 · 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. 1.1 + 2 + 3 + … + 19 =
2. 2.821 × 10 =
3. 3.Take 709. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.1 + 3 + 5 + … + 9 =
5. 5.Magic square (every row, column and diagonal has the same total): ? 17 7 | 5 13 21 | 19 9 11. What is the missing number?
6. 6.Take 275. Reverse its digits and take the smaller number away from the bigger one. What do you get?
7. 7.If today is Monday, what day will it be after 32 days? (a) Saturday (b) Monday (c) Friday (d) Thursday
8. 8.9 × 7 = 6? — what is the missing digit?
9. 9.652? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.1 + 3 + 5 + … + 17 =
11. 11.I thought of a number, added 7 and then doubled it. I got 24. What was my number?
12. 12.29 × 4 =
13. 13.Do the 1089 trick with 297: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.9 × 1 =
15. 15.I thought of a number, multiplied it by 2 and added 8. I got 26. What was my number?
16. 16.9 × 1000 =
17. 17.What comes next? 16, 20, 24, 28, ? (a) 36 (b) 32 (c) 28 (d) 33
18. 18.The ages of two twins add up to 26. How old is each twin?
19. 19.Double 71 =
20. 20.9 × 2 =
21. 21.33 × 1000 =
22. 22.123456 × 9 + 7 =
23. 23.Magic square (every row, column and diagonal has the same total): ? 8 29 | 26 20 14 | 11 32 17. What is the missing number?
24. 24.I thought of a number, multiplied it by 5 and added 6. I got 31. What was my number?
25. 25.The ages of two twins add up to 14. How old is each twin?
26. 26.7 × 9 =
27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
28. 28.Think of 3. Multiply it by 2, then add 7. What number do you end with?
29. 29.If today is Saturday, what day will it be after 21 days? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
30. 30.1 + 3 + 5 + … + 23 =
31. 31.43 × 4 =
32. 32.9 × 7 = ?3 — what is the missing digit?
33. 33.Think of 10. Multiply it by 4, then add 3. What number do you end with?
34. 34.12345 × 8 + 5 =
35. 35.Take 775. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.9 × 4 = ?6 — what is the missing digit?
37. 37.Half of 156 =
38. 38.I thought of a number, multiplied it by 5 and added 6. I got 56. What was my number?
39. 39.If today is Thursday, what day will it be after 83 days? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
40. 40.9 × 9 =

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