Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 838 · 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.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 6 years?
2. 2.What comes next? 3, 12, 21, 30, ? (a) 39 (b) 30 (c) 48 (d) 40
3. 3.?508 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 18 and take away the sum of its digits. What do you get?
5. 5.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 9 (c) 8 (d) 12
6. 6.A father is 45 years old and his son is 11. How old was the father when the son was born?
7. 7.If today is Monday, what day was it 32 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
8. 8.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 101 (c) 100 (d) 102
9. 9.Take 33 and take away the sum of its digits. What do you get?
10. 10.350 × ? = 3500
11. 11.55 × 100 =
12. 12.I thought of a number, multiplied it by 4 and added 2. I got 34. What was my number?
13. 13.What comes next? 16, 25, 36, 49, ? (a) 64 (b) 65 (c) 66 (d) 62
14. 14.998 × 10 =
15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
16. 16.12345679 × 27 =
17. 17.9 × 7 =
18. 18.60 × 100 =
19. 19.If today is Wednesday, what day will it be after 25 days? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
20. 20.397? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
22. 22.54 × 4 =
23. 23.9 × 10 = ?0 — what is the missing digit?
24. 24.Double 46 =
25. 25.Double 43 =
26. 26.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 32 (d) 33
27. 27.?871 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.1 + 3 + 5 + … + 11 =
30. 30.9 × 9 =
31. 31.1 + 2 + 3 + … + 14 =
32. 32.565 × 10 =
33. 33.If today is Monday, what day was it 55 days ago? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
34. 34.3 × 9 =
35. 35.9 × 4 = ?6 — what is the missing digit?
36. 36.123456789 × 8 + 9 =
37. 37.4 × 9 =
38. 38.Double 42 =
39. 39.Magic square (every row, column and diagonal has the same total): 11 25 15 | 21 ? 13 | 19 9 23. What is the missing number?
40. 40.1 + 2 + 3 + … + 80 =

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