Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 299 · 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.Take 945. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.6 × 9 =
3. 3.1 + 2 + 3 + … + 43 =
4. 4.Magic trick! Think of 5. Double it, add 8, halve it, then take away 5. What number do you get?
5. 5.36 × ? = 36000
6. 6.A father is 33 years old and his son is 6. How old was the father when the son was born?
7. 7.I thought of a number, added 8 and then doubled it. I got 26. What was my number?
8. 8.198 + 891 =
9. 9.396 + 693 =
10. 10.The 3rd of a month is a Sunday. What day is the 29th of the same month? (a) Thursday (b) Friday (c) Monday (d) Saturday
11. 11.495 + 594 =
12. 12.Take 268. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.9 × 1 =
14. 14.What comes next? 7, 16, 25, 34, ? (a) 34 (b) 52 (c) 43 (d) 44
15. 15.Take 43 and take away the sum of its digits. What do you get?
16. 16.9 × 10 = ?0 — what is the missing digit?
17. 17.Magic square (every row, column and diagonal has the same total): 11 10 15 | 16 12 8 | 9 14 ?. What is the missing number?
18. 18.791? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.516 × 10 =
20. 20.Magic square (every row, column and diagonal has the same total): 15 8 13 | 10 12 14 | ? 16 9. What is the missing number?
21. 21.32 × 4 =
22. 22.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | 5 ? 9. What is the missing number?
23. 23.1234 × 8 + 4 =
24. 24.Magic trick! Think of 19. Double it, add 14, halve it, then take away 19. What number do you get?
25. 25.Double 17 =
26. 26.37 × 12 =
27. 27.693 + 396 =
28. 28.If today is Sunday, what day was it 18 days ago? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
29. 29.3 × 9 =
30. 30.891 + 198 =
31. 31.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 18 (c) 12 (d) 19
32. 32.Magic square (every row, column and diagonal has the same total): ? 9 16 | 15 13 11 | 10 17 12. What is the missing number?
33. 33.33 × 10 =
34. 34.Half of 22 =
35. 35.Double 49 =
36. 36.1 + 2 + 3 + … + 34 =
37. 37.1 + 2 + 3 + … + 70 =
38. 38.Double 57 =
39. 39.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 8 years?
40. 40.Do the 1089 trick with 850: reverse and subtract, then reverse that answer and add. What do you get?

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