Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 397 · 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.Think of 2. Multiply it by 2, then add 1. What number do you end with?
2. 2.Take 20 and take away the sum of its digits. What do you get?
3. 3.The 1st of a month is a Sunday. What day is the 17th of the same month? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
4. 4.Double 32 =
5. 5.57 × 4 =
6. 6.Think of 6. Multiply it by 2, then add 1. What number do you end with?
7. 7.I thought of a number, added 2 and then doubled it. I got 42. What was my number?
8. 8.1 + 2 + 3 + … + 60 =
9. 9.123 × 8 + 3 =
10. 10.Half of 28 =
11. 11.29 × 1000 =
12. 12.1 + 2 + 3 + … + 48 =
13. 13.15 × 100 =
14. 14.?942 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Magic square (every row, column and diagonal has the same total): 19 21 11 | 9 ? 25 | 23 13 15. What is the missing number?
16. 16.9 × 4 = ?6 — what is the missing digit?
17. 17.9 × 8 = ?2 — what is the missing digit?
18. 18.297 + 792 =
19. 19.A father is 44 years old and his son is 8. How old was the father when the son was born?
20. 20.Half of 152 =
21. 21.Magic square (every row, column and diagonal has the same total): ? 14 13 | 16 12 8 | 11 10 15. What is the missing number?
22. 22.1 + 3 + 5 + … + 35 =
23. 23.1 + 2 + 3 + … + 13 =
24. 24.If today is Sunday, what day will it be after 46 days? (a) Wednesday (b) Friday (c) Sunday (d) Thursday
25. 25.123 × 9 + 4 =
26. 26.Double 82 =
27. 27.I thought of a number, multiplied it by 2 and added 8. I got 16. What was my number?
28. 28.547 × 10 =
29. 29.Think of 4. Multiply it by 5, then add 3. What number do you end with?
30. 30.12 × 4 =
31. 31.1 + 3 + 5 + … + 13 =
32. 32.A father is 37 years old and his son is 11. How old was the father when the son was born?
33. 33.What comes next? 19, 22, 25, 28, ? (a) 31 (b) 32 (c) 34 (d) 28
34. 34.683 × ? = 6830
35. 35.7 × 4 =
36. 36.1 + 2 + 3 + … + 98 =
37. 37.4?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.Magic square (every row, column and diagonal has the same total): ? 4 9 | 6 8 10 | 7 12 5. What is the missing number?
39. 39.Double 22 =
40. 40.9 × 8 = 7? — what is the missing digit?

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