Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 95 · 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. 1.48 × 1000 =
2. 2.If today is Tuesday, what day will it be after 81 days? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
3. 3.Double 82 =
4. 4.1 + 2 + 3 + … + 7 =
5. 5.1 + 3 + 5 + … + 13 =
6. 6.The 7th of a month is a Friday. What day is the 19th of the same month? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
7. 7.37 × 27 =
8. 8.I thought of a number, added 3 and then doubled it. I got 38. What was my number?
9. 9.32 × 4 =
10. 10.1234567 × 9 + 8 =
11. 11.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 60 (c) 70 (d) 80
12. 12.93 × ? = 9300
13. 13.If today is Thursday, what day was it 14 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
14. 14.9 × 6 = 5? — what is the missing digit?
15. 15.Half of 132 =
16. 16.The 6th of a month is a Monday. What day is the 23rd of the same month? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
17. 17.I thought of a number, multiplied it by 4 and added 8. I got 16. What was my number?
18. 18.Magic square (every row, column and diagonal has the same total): 20 6 16 | 10 14 18 | 12 22 ?. What is the missing number?
19. 19.Double 31 =
20. 20.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
21. 21.Odd one out: which number is NOT in the 7 times table? (a) 28 (b) 49 (c) 56 (d) 62
22. 22.If today is Monday, what day was it 39 days ago? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
23. 23.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
24. 24.15 × 4 =
25. 25.52 × 4 =
26. 26.9 × 7 = ?3 — what is the missing digit?
27. 27.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
28. 28.A father is 31 years old and his son is 10. How old was the father when the son was born?
29. 29.30 × 4 =
30. 30.396 + 693 =
31. 31.Do the 1089 trick with 967: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.47 × 1000 =
33. 33.Take 552. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.12345679 × 81 =
35. 35.Half of 108 =
36. 36.56 × 4 =
37. 37.1 + 2 + 3 + … + 83 =
38. 38.1 + 3 + 5 + … + 47 =
39. 39.A father is 38 years old and his son is 10. How old was the father when the son was born?
40. 40.3 × 9 =

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