Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 174 · 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.The 3rd of a month is a Monday. What day is the 17th of the same month? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
2. 2.1234567 × 8 + 7 =
3. 3.If today is Saturday, what day was it 17 days ago? (a) Tuesday (b) Thursday (c) Wednesday (d) Saturday
4. 4.259 × 10 =
5. 5.1 + 2 + 3 + … + 85 =
6. 6.9 × 2 = 1? — what is the missing digit?
7. 7.66?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.1 + 3 + 5 + … + 13 =
9. 9.9 × 7 = ?3 — what is the missing digit?
10. 10.Double 26 =
11. 11.Magic trick! Think of 17. Double it, add 18, halve it, then take away 17. What number do you get?
12. 12.What comes next? 13, 19, 25, 31, ? (a) 43 (b) 31 (c) 38 (d) 37
13. 13.12345679 × 63 =
14. 14.The ages of two twins add up to 18. How old is each twin?
15. 15.1234567 × 9 + 8 =
16. 16.Magic trick! Think of 6. Double it, add 8, halve it, then take away 6. What number do you get?
17. 17.9 × 4 = ?6 — what is the missing digit?
18. 18.1 + 2 + 3 + … + 92 =
19. 19.Half of 182 =
20. 20.37 × 12 =
21. 21.12345679 × 54 =
22. 22.Take 550. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.I thought of a number, multiplied it by 4 and added 1. I got 41. What was my number?
24. 24.I thought of a number, multiplied it by 3 and added 4. I got 40. What was my number?
25. 25.28 × 4 =
26. 26.1 + 2 + 3 + … + 67 =
27. 27.6 × 9 =
28. 28.53 × 4 =
29. 29.If today is Saturday, what day will it be after 52 days? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
30. 30.?93 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.1 + 2 + 3 + … + 9 =
32. 32.Half of 32 =
33. 33.A father is 30 years old and his son is 13. How old was the father when the son was born?
34. 34.9 × 10 =
35. 35.Think of 3. Multiply it by 2, then add 7. What number do you end with?
36. 36.If today is Sunday, what day was it 46 days ago? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
37. 37.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 7 | 13 3 ?. What is the missing number?
38. 38.If today is Tuesday, what day will it be after 78 days? (a) Wednesday (b) Thursday (c) Saturday (d) Tuesday
39. 39.13 × 4 =
40. 40.14 × 100 =

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