Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 53 · 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. 1.45 × 4 =
2. 2.9 × 7 =
3. 3.12345679 × 54 =
4. 4.9 × 5 = 4? — what is the missing digit?
5. 5.If today is Sunday, what day was it 56 days ago? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
6. 6.Magic square (every row, column and diagonal has the same total): 16 11 12 | ? 13 17 | 14 15 10. What is the missing number?
7. 7.104? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Do the 1089 trick with 239: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.Take 22 and take away the sum of its digits. What do you get?
10. 10.Do the 1089 trick with 830: reverse and subtract, then reverse that answer and add. What do you get?
11. 11.The 4th of a month is a Thursday. What day is the 13th of the same month? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
12. 12.Magic square (every row, column and diagonal has the same total): 8 9 4 | ? 7 11 | 10 5 6. What is the missing number?
13. 13.1234 × 9 + 5 =
14. 14.35 × 4 =
15. 15.The 3rd of a month is a Tuesday. What day is the 26th of the same month? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
16. 16.If today is Thursday, what day was it 55 days ago? (a) Thursday (b) Friday (c) Monday (d) Saturday
17. 17.9 × 10 = 9? — what is the missing digit?
18. 18.Half of 82 =
19. 19.9 × 4 =
20. 20.38 × ? = 38000
21. 21.What comes next? 1, 4, 7, 10, ? (a) 10 (b) 13 (c) 16 (d) 14
22. 22.If today is Saturday, what day will it be after 48 days? (a) Monday (b) Friday (c) Saturday (d) Thursday
23. 23.A father is 43 years old and his son is 12. How old was the father when the son was born?
24. 24.10 × 9 =
25. 25.1 + 3 + 5 + … + 19 =
26. 26.Half of 32 =
27. 27.693 + 396 =
28. 28.Take 60 and take away the sum of its digits. What do you get?
29. 29.The ages of two twins add up to 26. How old is each twin?
30. 30.?971 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.213 × ? = 2130
32. 32.9 × 7 = 6? — what is the missing digit?
33. 33.Double 96 =
34. 34.I thought of a number, multiplied it by 5 and added 1. I got 21. What was my number?
35. 35.Do the 1089 trick with 915: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.1111 × 1111 =
37. 37.Magic square (every row, column and diagonal has the same total): 12 7 8 | 5 9 13 | 10 11 ?. What is the missing number?
38. 38.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 30 (c) 28 (d) 12
39. 39.32 × 1000 =
40. 40.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 31 (c) 42 (d) 30

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