Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 521 · 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. 1.9 × 10 = 9? — what is the missing digit?
2. 2.Half of 42 =
3. 3.Magic square (every row, column and diagonal has the same total): ? 21 7 | 9 13 17 | 19 5 15. What is the missing number?
4. 4.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 6 years?
5. 5.111111 × 111111 =
6. 6.11111 × 11111 =
7. 7.29 × 4 =
8. 8.396 + 693 =
9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
10. 10.10 × 9 =
11. 11.1 + 2 + 3 + … + 31 =
12. 12.What comes next? 16, 20, 24, 28, ? (a) 28 (b) 32 (c) 36 (d) 33
13. 13.?710 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.If today is Thursday, what day will it be after 57 days? (a) Monday (b) Saturday (c) Thursday (d) Friday
15. 15.What comes next? 4, 7, 10, 13, ? (a) 17 (b) 13 (c) 19 (d) 16
16. 16.Magic trick! Think of 7. Double it, add 10, halve it, then take away 7. What number do you get?
17. 17.I thought of a number, multiplied it by 5 and added 3. I got 43. What was my number?
18. 18.Magic square (every row, column and diagonal has the same total): ? 8 23 | 14 20 26 | 17 32 11. What is the missing number?
19. 19.Half of 32 =
20. 20.44 × ? = 4400
21. 21.Double 46 =
22. 22.57 × 4 =
23. 23.1 + 2 + 3 + … + 10 =
24. 24.Take 577. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.998 × ? = 9980
26. 26.Double 95 =
27. 27.Magic square (every row, column and diagonal has the same total): 15 30 9 | 12 ? 24 | 27 6 21. What is the missing number?
28. 28.Magic square (every row, column and diagonal has the same total): 14 29 26 | 35 23 11 | 20 ? 32. What is the missing number?
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
30. 30.A girl is 12 years old and her brother is 2 years older. How old will her brother be in 5 years?
31. 31.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 2 years?
32. 32.24 × 4 =
33. 33.Magic square (every row, column and diagonal has the same total): 20 5 26 | 23 ? 11 | 8 29 14. What is the missing number?
34. 34.2 × 9 =
35. 35.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 26 (c) 23 (d) 25
36. 36.9 × 6 = ?4 — what is the missing digit?
37. 37.Take 34 and take away the sum of its digits. What do you get?
38. 38.9 × 5 =
39. 39.Magic square (every row, column and diagonal has the same total): 14 15 10 | ? 13 17 | 16 11 12. What is the missing number?
40. 40.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 5 years?

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