Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 836 · 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 × 5 =
2. 2.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 9 years?
3. 3.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
4. 4.45 × 4 =
5. 5.9 × 9 =
6. 6.1234567 × 9 + 8 =
7. 7.37 × 24 =
8. 8.Magic trick! Think of 6. Double it, add 14, halve it, then take away 6. What number do you get?
9. 9.Half of 54 =
10. 10.16?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Magic square (every row, column and diagonal has the same total): ? 15 17 | 11 19 27 | 21 23 13. What is the missing number?
12. 12.I thought of a number, added 9 and then doubled it. I got 26. What was my number?
13. 13.Double 88 =
14. 14.1 + 2 + 3 + … + 33 =
15. 15.33 × 4 =
16. 16.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.693 + 396 =
18. 18.37 × 6 =
19. 19.690? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.If today is Thursday, what day was it 39 days ago? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
21. 21.9 × 10 = ?0 — what is the missing digit?
22. 22.56 × 4 =
23. 23.30 × 100 =
24. 24.12 × 9 + 3 =
25. 25.Take 85 and take away the sum of its digits. What do you get?
26. 26.What comes next? 1, 8, 15, 22, ? (a) 22 (b) 29 (c) 36 (d) 30
27. 27.12345679 × 18 =
28. 28.Half of 136 =
29. 29.What comes next? 9, 16, 25, 36, ? (a) 51 (b) 49 (c) 47 (d) 50
30. 30.Think of 8. Multiply it by 2, then add 2. What number do you end with?
31. 31.In 3 years a boy will be 16 years old. How old was he 3 years ago?
32. 32.The 2nd of a month is a Tuesday. What day is the 24th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
33. 33.58 × 4 =
34. 34.Odd one out: which number is NOT in the 8 times table? (a) 48 (b) 49 (c) 72 (d) 32
35. 35.What comes next? 20, 28, 36, 44, ? (a) 52 (b) 53 (c) 44 (d) 60
36. 36.1 + 3 + 5 + … + 41 =
37. 37.Take 18 and take away the sum of its digits. What do you get?
38. 38.The 1st of a month is a Tuesday. What day is the 12th of the same month? (a) Sunday (b) Saturday (c) Friday (d) Tuesday
39. 39.12345679 × 45 =
40. 40.If today is Monday, what day will it be after 47 days? (a) Sunday (b) Saturday (c) Friday (d) Tuesday

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