Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 593 · 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. 1.23 × 1000 =
2. 2.1 + 2 + 3 + … + 34 =
3. 3.I thought of a number, added 8 and then doubled it. I got 22. What was my number?
4. 4.If today is Monday, what day was it 20 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
5. 5.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
6. 6.58 × 4 =
7. 7.Think of 15. Multiply it by 3, then add 9. What number do you end with?
8. 8.16 × 4 =
9. 9.1 + 2 + 3 + … + 99 =
10. 10.Odd one out: which number is NOT in the 5 times table? (a) 44 (b) 10 (c) 20 (d) 30
11. 11.33 × 4 =
12. 12.If today is Wednesday, what day will it be after 57 days? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
13. 13.1 × 9 =
14. 14.I thought of a number, multiplied it by 3 and added 2. I got 8. What was my number?
15. 15.A father is 39 years old and his son is 14. How old was the father when the son was born?
16. 16.Double 96 =
17. 17.Take 98 and take away the sum of its digits. What do you get?
18. 18.9 × 5 = ?5 — what is the missing digit?
19. 19.Take 310. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.9 × 10 = 9? — what is the missing digit?
21. 21.1 + 2 + 3 + … + 46 =
22. 22.Think of 11. Multiply it by 5, then add 9. What number do you end with?
23. 23.9 × 3 =
24. 24.9 × 10 =
25. 25.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 5 years?
26. 26.30 × 100 =
27. 27.123456789 × 8 + 9 =
28. 28.Odd one out: which number is NOT in the 5 times table? (a) 22 (b) 30 (c) 20 (d) 10
29. 29.Double 28 =
30. 30.Odd one out: which number is NOT in the 3 times table? (a) 12 (b) 15 (c) 18 (d) 23
31. 31.9 × 2 = ?8 — what is the missing digit?
32. 32.1 + 2 + 3 + … + 56 =
33. 33.I thought of a number, added 4 and then doubled it. I got 30. What was my number?
34. 34.Half of 82 =
35. 35.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 15 21 | ? 3 18. What is the missing number?
36. 36.9 × 10 = ?0 — what is the missing digit?
37. 37.49 × 4 =
38. 38.123456 × 9 + 7 =
39. 39.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 12 | ? 6 11. What is the missing number?
40. 40.1 + 2 + 3 + … + 8 =

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