Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 693 · 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.A father is 39 years old and his son is 9. How old was the father when the son was born?
2. 2.The 4th of a month is a Saturday. What day is the 12th of the same month? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
3. 3.Half of 96 =
4. 4.Double 95 =
5. 5.25 × 4 =
6. 6.12 × 4 =
7. 7.1 × 9 =
8. 8.9 × 3 = ?7 — what is the missing digit?
9. 9.12345679 × 9 =
10. 10.Double 16 =
11. 11.Double 83 =
12. 12.396 + 693 =
13. 13.Magic square (every row, column and diagonal has the same total): 16 13 28 | ? 19 7 | 10 25 22. What is the missing number?
14. 14.Magic square (every row, column and diagonal has the same total): 10 31 16 | 25 19 13 | ? 7 28. What is the missing number?
15. 15.1 + 3 + 5 + … + 43 =
16. 16.A father is 45 years old and his son is 9. How old was the father when the son was born?
17. 17.Magic trick! Think of 11. Double it, add 10, halve it, then take away 11. What number do you get?
18. 18.Magic square (every row, column and diagonal has the same total): 7 17 15 | 21 ? 5 | 11 9 19. What is the missing number?
19. 19.1 + 2 + 3 + … + 72 =
20. 20.Magic square (every row, column and diagonal has the same total): 18 21 6 | 3 15 27 | 24 ? 12. What is the missing number?
21. 21.19 × 1000 =
22. 22.792 + 297 =
23. 23.What comes next? 8, 14, 20, 26, ? (a) 38 (b) 26 (c) 33 (d) 32
24. 24.Magic square (every row, column and diagonal has the same total): 8 23 20 | 29 17 5 | ? 11 26. What is the missing number?
25. 25.9 × 2 =
26. 26.46 × 1000 =
27. 27.89?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.90 × ? = 9000
29. 29.37 × 9 =
30. 30.Odd one out: which number is NOT in the 9 times table? (a) 33 (b) 27 (c) 81 (d) 54
31. 31.3 × 9 =
32. 32.The 2nd of a month is a Tuesday. What day is the 14th of the same month? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
33. 33.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.53 × 4 =
35. 35.9 × 4 =
36. 36.198 + 891 =
37. 37.The ages of two twins add up to 20. How old is each twin?
38. 38.9 × 2 = ?8 — what is the missing digit?
39. 39.8 × 4 =
40. 40.Half of 118 =

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