Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 303 · 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.Do the 1089 trick with 305: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.9 × 9 =
3. 3.A father is 45 years old and his son is 7. How old was the father when the son was born?
4. 4.12345679 × 27 =
5. 5.Double 93 =
6. 6.9 × 3 = ?7 — what is the missing digit?
7. 7.Take 22 and take away the sum of its digits. What do you get?
8. 8.1 + 2 + 3 + … + 97 =
9. 9.A father is 38 years old and his son is 10. How old was the father when the son was born?
10. 10.Magic trick! Think of 20. Double it, add 10, halve it, then take away 20. What number do you get?
11. 11.Think of 10. Multiply it by 4, then add 7. What number do you end with?
12. 12.40 × 4 =
13. 13.If today is Monday, what day was it 16 days ago? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
14. 14.Half of 188 =
15. 15.37 × 15 =
16. 16.Take 813. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.9 × 5 = ?5 — what is the missing digit?
18. 18.Think of 10. Multiply it by 5, then add 4. What number do you end with?
19. 19.1 + 2 + 3 + … + 10 =
20. 20.62 × 100 =
21. 21.Magic trick! Think of 19. Double it, add 14, halve it, then take away 19. What number do you get?
22. 22.Take 270. Reverse its digits and take the smaller number away from the bigger one. What do you get?
23. 23.A father is 45 years old and his son is 6. How old was the father when the son was born?
24. 24.1 + 3 + 5 + … + 31 =
25. 25.If today is Monday, what day was it 23 days ago? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
26. 26.9 × 10 = 9? — what is the missing digit?
27. 27.123 × 9 + 4 =
28. 28.3?35 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.Magic square (every row, column and diagonal has the same total): 11 ? 19 | 21 13 5 | 7 17 15. What is the missing number?
30. 30.891 + 198 =
31. 31.12 × 8 + 2 =
32. 32.The 6th of a month is a Wednesday. What day is the 17th of the same month? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
33. 33.12345679 × 72 =
34. 34.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 28 (c) 12 (d) 22
35. 35.9 × 9 = ?1 — what is the missing digit?
36. 36.12345679 × 18 =
37. 37.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 28 (c) 32 (d) 24
38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
39. 39.9 × 4 =
40. 40.37 × 3 =

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