Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 518 · 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.If today is Friday, what day was it 19 days ago? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
2. 2.9 × 9 =
3. 3.Double 98 =
4. 4.26 × 1000 =
5. 5.In 5 years a boy will be 19 years old. How old was he 2 years ago?
6. 6.Take 96 and take away the sum of its digits. What do you get?
7. 7.37 × 24 =
8. 8.The 5th of a month is a Saturday. What day is the 25th of the same month? (a) Monday (b) Friday (c) Saturday (d) Thursday
9. 9.495 + 594 =
10. 10.951 × 10 =
11. 11.Think of 8. Multiply it by 5, then add 3. What number do you end with?
12. 12.I thought of a number, added 5 and then doubled it. I got 32. What was my number?
13. 13.1 + 3 + 5 + … + 49 =
14. 14.Magic trick! Think of 8. Double it, add 14, halve it, then take away 8. What number do you get?
15. 15.792 + 297 =
16. 16.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 3 years?
17. 17.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 47 (c) 49 (d) 50
18. 18.Magic square (every row, column and diagonal has the same total): 32 17 20 | 11 ? 35 | 26 29 14. What is the missing number?
19. 19.I thought of a number, added 9 and then doubled it. I got 26. What was my number?
20. 20.A father is 38 years old and his son is 6. How old was the father when the son was born?
21. 21.250 × ? = 2500
22. 22.The ages of two twins add up to 10. How old is each twin?
23. 23.3 × 1000 =
24. 24.1 + 3 + 5 + … + 21 =
25. 25.9 × 2 = ?8 — what is the missing digit?
26. 26.23 × 4 =
27. 27.9 × 8 =
28. 28.Double 34 =
29. 29.1 + 2 + 3 + … + 21 =
30. 30.1 + 2 + 3 + … + 97 =
31. 31.1111 × 1111 =
32. 32.14 × 1000 =
33. 33.9 × 2 = 1? — what is the missing digit?
34. 34.9 × 10 = ?0 — what is the missing digit?
35. 35.Double 48 =
36. 36.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 15 23 | 21 11 ?. What is the missing number?
37. 37.9 × 5 = 4? — what is the missing digit?
38. 38.1 + 3 + 5 + … + 41 =
39. 39.9 × 10 =
40. 40.Take 280. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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