Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 192 · 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. 1.648 × 10 =
2. 2.198 + 891 =
3. 3.Take 947. Reverse its digits and take the smaller number away from the bigger one. What do you get?
4. 4.37 × 12 =
5. 5.Half of 136 =
6. 6.Magic square (every row, column and diagonal has the same total): 4 3 8 | 9 5 1 | 2 ? 6. What is the missing number?
7. 7.9 × 2 = ?8 — what is the missing digit?
8. 8.122? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.31 × 4 =
10. 10.If today is Wednesday, what day was it 53 days ago? (a) Saturday (b) Sunday (c) Tuesday (d) Friday
11. 11.Double 41 =
12. 12.Magic trick! Think of 4. Double it, add 12, halve it, then take away 4. What number do you get?
13. 13.Do the 1089 trick with 861: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.9 × 3 = ?7 — what is the missing digit?
15. 15.1 + 3 + 5 + … + 35 =
16. 16.7?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.The 3rd of a month is a Tuesday. What day is the 28th of the same month? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
18. 18.The 2nd of a month is a Monday. What day is the 29th of the same month? (a) Sunday (b) Monday (c) Saturday (d) Wednesday
19. 19.Think of 5. Multiply it by 2, then add 2. What number do you end with?
20. 20.1 + 2 + 3 + … + 64 =
21. 21.Do the 1089 trick with 530: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.47 × 1000 =
23. 23.19 × 4 =
24. 24.7 × 4 =
25. 25.12345679 × 18 =
26. 26.The ages of two twins add up to 16. How old is each twin?
27. 27.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
28. 28.Magic square (every row, column and diagonal has the same total): 16 6 20 | 18 14 10 | 8 22 ?. What is the missing number?
29. 29.9 × 10 =
30. 30.Odd one out: which number is NOT in the 7 times table? (a) 49 (b) 39 (c) 42 (d) 21
31. 31.9 × 7 = ?3 — what is the missing digit?
32. 32.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.2 × 9 =
34. 34.771 × ? = 7710
35. 35.Magic square (every row, column and diagonal has the same total): 5 4 9 | 10 6 2 | 3 ? 7. What is the missing number?
36. 36.Double 83 =
37. 37.1 + 3 + 5 + … + 27 =
38. 38.162? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.693 + 396 =
40. 40.Take 91 and take away the sum of its digits. What do you get?

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