Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 792 · 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. 1.1 + 2 + 3 + … + 93 =
2. 2.If today is Thursday, what day was it 49 days ago? (a) Wednesday (b) Thursday (c) Sunday (d) Friday
3. 3.41 × 4 =
4. 4.If today is Tuesday, what day will it be after 23 days? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
5. 5.1111 × 1111 =
6. 6.9 × 6 = 5? — what is the missing digit?
7. 7.Double 61 =
8. 8.A father is 34 years old and his son is 10. How old was the father when the son was born?
9. 9.9 × 8 = 7? — what is the missing digit?
10. 10.37 × 15 =
11. 11.Think of 5. Multiply it by 2, then add 8. What number do you end with?
12. 12.8?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Double 42 =
14. 14.9 × 1 =
15. 15.1 + 2 + 3 + … + 69 =
16. 16.57?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.12345678 × 9 + 9 =
18. 18.Take 21 and take away the sum of its digits. What do you get?
19. 19.If today is Sunday, what day will it be after 92 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
20. 20.Think of 10. Multiply it by 2, then add 1. What number do you end with?
21. 21.If today is Sunday, what day will it be after 61 days? (a) Monday (b) Saturday (c) Friday (d) Thursday
22. 22.What comes next? 16, 22, 28, 34, ? (a) 46 (b) 34 (c) 40 (d) 41
23. 23.The ages of two twins add up to 8. How old is each twin?
24. 24.Take 247. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.?170 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.352 × ? = 3520
27. 27.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
28. 28.Half of 198 =
29. 29.27 × 4 =
30. 30.12 × 8 + 2 =
31. 31.45 × 4 =
32. 32.Think of 3. Multiply it by 5, then add 6. What number do you end with?
33. 33.Magic trick! Think of 12. Double it, add 8, halve it, then take away 12. What number do you get?
34. 34.What comes next? 3, 7, 11, 15, ? (a) 15 (b) 20 (c) 19 (d) 23
35. 35.9 × 7 = 6? — what is the missing digit?
36. 36.Take 186. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.12 × 4 =
38. 38.Magic square (every row, column and diagonal has the same total): 20 35 14 | 17 23 ? | 32 11 26. What is the missing number?
39. 39.1 + 2 + 3 + … + 12 =
40. 40.1 + 2 + 3 + … + 68 =

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