Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 772 · 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. 1.594 + 495 =
2. 2.37 × 21 =
3. 3.?363 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 16 (c) 12 (d) 17
5. 5.30 × 100 =
6. 6.If today is Wednesday, what day will it be after 100 days? (a) Thursday (b) Friday (c) Monday (d) Saturday
7. 7.1 + 2 + 3 + … + 69 =
8. 8.6 × 9 =
9. 9.Magic square (every row, column and diagonal has the same total): 18 15 30 | 33 21 9 | ? 27 24. What is the missing number?
10. 10.12345 × 9 + 6 =
11. 11.1234 × 8 + 4 =
12. 12.2 × 9 =
13. 13.Do the 1089 trick with 992: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.I thought of a number, added 1 and then doubled it. I got 28. What was my number?
15. 15.50 × 4 =
16. 16.Magic trick! Think of 17. Double it, add 12, halve it, then take away 17. What number do you get?
17. 17.49 × 100 =
18. 18.12 × 9 + 3 =
19. 19.9 × 1000 =
20. 20.Magic square (every row, column and diagonal has the same total): 16 14 24 | 26 ? 10 | 12 22 20. What is the missing number?
21. 21.1 + 3 + 5 + … + 9 =
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
23. 23.I thought of a number, multiplied it by 2 and added 9. I got 35. What was my number?
24. 24.12345679 × 54 =
25. 25.Take 158. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 80 (d) 60
27. 27.22 × 4 =
28. 28.Double 91 =
29. 29.Magic square (every row, column and diagonal has the same total): 26 5 ? | 11 17 23 | 14 29 8. What is the missing number?
30. 30.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 24 (c) 17 (d) 28
31. 31.46 × 1000 =
32. 32.Magic square (every row, column and diagonal has the same total): 3 8 7 | 10 6 2 | ? 4 9. What is the missing number?
33. 33.12345679 × 72 =
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
35. 35.46?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.I thought of a number, added 9 and then doubled it. I got 42. What was my number?
37. 37.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 50 (c) 47 (d) 49
38. 38.37 × 18 =
39. 39.17 × 4 =
40. 40.Magic square (every row, column and diagonal has the same total): 24 9 ? | 3 15 27 | 18 21 6. What is the missing number?

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