Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 598 · 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.Magic trick! Think of 13. Double it, add 10, halve it, then take away 13. What number do you get?
2. 2.If today is Tuesday, what day will it be after 36 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
3. 3.1 + 3 + 5 + … + 19 =
4. 4.51 × 4 =
5. 5.In 5 years a boy will be 15 years old. How old was he 5 years ago?
6. 6.9 × 3 =
7. 7.19 × 4 =
8. 8.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | 5 ? 9. What is the missing number?
9. 9.1 + 2 + 3 + … + 36 =
10. 10.37 × 21 =
11. 11.Take 179. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.527 × 10 =
13. 13.A girl is 10 years old and her brother is 6 years older. How old will her brother be in 9 years?
14. 14.If today is Wednesday, what day was it 52 days ago? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
15. 15.59 × 4 =
16. 16.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 48 (c) 65 (d) 64
17. 17.44 × 4 =
18. 18.If today is Wednesday, what day will it be after 98 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
19. 19.I thought of a number, multiplied it by 5 and added 4. I got 39. What was my number?
20. 20.1 + 2 + 3 + … + 54 =
21. 21.Do the 1089 trick with 135: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.1 + 3 + 5 + … + 13 =
23. 23.29 × 1000 =
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
25. 25.12345679 × 27 =
26. 26.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
27. 27.533 × ? = 5330
28. 28.40 × 100 =
29. 29.Double 19 =
30. 30.Do the 1089 trick with 641: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.If today is Saturday, what day was it 31 days ago? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
32. 32.Take 21 and take away the sum of its digits. What do you get?
33. 33.9 × 9 = ?1 — what is the missing digit?
34. 34.49 × 100 =
35. 35.Take 610. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.12345679 × 45 =
37. 37.Double 74 =
38. 38.11 × 11 =
39. 39.Magic trick! Think of 15. Double it, add 16, halve it, then take away 15. What number do you get?
40. 40.7 × 9 =

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