Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 423 · 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. 1.2?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Magic square (every row, column and diagonal has the same total): 13 6 11 | 8 10 ? | 9 14 7. What is the missing number?
3. 3.If today is Friday, what day will it be after 80 days? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
4. 4.Do the 1089 trick with 472: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.If today is Friday, what day was it 12 days ago? (a) Sunday (b) Monday (c) Wednesday (d) Saturday
6. 6.1 + 3 + 5 + … + 19 =
7. 7.If today is Tuesday, what day will it be after 76 days? (a) Sunday (b) Monday (c) Tuesday (d) Thursday
8. 8.Take 420. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.I thought of a number, multiplied it by 5 and added 1. I got 16. What was my number?
10. 10.8 × 9 =
11. 11.Think of 8. Multiply it by 5, then add 9. What number do you end with?
12. 12.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 17 29 | 26 11 ?. What is the missing number?
13. 13.571 × 10 =
14. 14.Think of 4. Multiply it by 3, then add 4. What number do you end with?
15. 15.1 + 2 + 3 + … + 41 =
16. 16.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 16 (d) 12
17. 17.Magic square (every row, column and diagonal has the same total): 32 17 20 | ? 23 35 | 26 29 14. What is the missing number?
18. 18.Take 11 and take away the sum of its digits. What do you get?
19. 19.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
21. 21.1234 × 9 + 5 =
22. 22.15 × ? = 15000
23. 23.995 × 10 =
24. 24.Odd one out: which number is NOT in the 3 times table? (a) 9 (b) 18 (c) 6 (d) 10
25. 25.49?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.If today is Monday, what day was it 43 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
27. 27.If today is Wednesday, what day was it 10 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
28. 28.9 × 6 =
29. 29.I thought of a number, multiplied it by 2 and added 8. I got 36. What was my number?
30. 30.159 × ? = 1590
31. 31.756 × 10 =
32. 32.If today is Wednesday, what day was it 40 days ago? (a) Thursday (b) Monday (c) Saturday (d) Friday
33. 33.15 × 4 =
34. 34.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 15 | 17 3 ?. What is the missing number?
35. 35.42? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.?026 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.52 × 4 =
38. 38.The 6th of a month is a Sunday. What day is the 15th of the same month? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
39. 39.Magic trick! Think of 5. Double it, add 12, halve it, then take away 5. What number do you get?
40. 40.9 × 2 = 1? — what is the missing digit?

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