Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 659 · 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. 1.12345679 × 63 =
2. 2.If today is Friday, what day was it 12 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
3. 3.Take 658. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.Double 12 =
5. 5.552 × 10 =
6. 6.171 × ? = 1710
7. 7.If today is Wednesday, what day was it 55 days ago? (a) Friday (b) Sunday (c) Thursday (d) Wednesday
8. 8.Take 63 and take away the sum of its digits. What do you get?
9. 9.9 × 9 =
10. 10.1 + 2 + 3 + … + 11 =
11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
12. 12.9 × 5 = 4? — what is the missing digit?
13. 13.282 × 10 =
14. 14.If today is Saturday, what day was it 14 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
15. 15.42 × 4 =
16. 16.24 × 100 =
17. 17.A father is 30 years old and his son is 5. How old was the father when the son was born?
18. 18.2 × 9 =
19. 19.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
20. 20.Double 13 =
21. 21.Magic trick! Think of 13. Double it, add 8, halve it, then take away 13. What number do you get?
22. 22.14?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.I thought of a number, multiplied it by 4 and added 6. I got 34. What was my number?
24. 24.1 + 3 + 5 + … + 19 =
25. 25.11111 × 11111 =
26. 26.The ages of two twins add up to 12. How old is each twin?
27. 27.9 × 1000 =
28. 28.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 49 (c) 48 (d) 36
29. 29.Magic square (every row, column and diagonal has the same total): 10 ? 14 | 15 11 7 | 8 13 12. What is the missing number?
30. 30.870 × 10 =
31. 31.Think of 11. Multiply it by 3, then add 3. What number do you end with?
32. 32.1 + 2 + 3 + … + 38 =
33. 33.Do the 1089 trick with 602: reverse and subtract, then reverse that answer and add. What do you get?
34. 34.1 + 2 + 3 + … + 44 =
35. 35.9 × 7 =
36. 36.I thought of a number, added 3 and then doubled it. I got 30. What was my number?
37. 37.9 × 7 = ?3 — what is the missing digit?
38. 38.9 × 6 = ?4 — what is the missing digit?
39. 39.What comes next? 2, 5, 8, 11, ? (a) 17 (b) 11 (c) 15 (d) 14
40. 40.40 × 4 =

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