Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 385 · 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. 1.37 × 9 =
2. 2.Do the 1089 trick with 870: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.9 × 8 = ?2 — what is the missing digit?
4. 4.Magic square (every row, column and diagonal has the same total): 24 ? 12 | 9 21 33 | 30 15 18. What is the missing number?
5. 5.The ages of two twins add up to 20. How old is each twin?
6. 6.Magic square (every row, column and diagonal has the same total): ? 11 6 | 9 7 5 | 8 3 10. What is the missing number?
7. 7.Double 69 =
8. 8.9 × 4 = ?6 — what is the missing digit?
9. 9.495 + 594 =
10. 10.The 3rd of a month is a Saturday. What day is the 28th of the same month? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
11. 11.32 × 4 =
12. 12.1 + 3 + 5 + … + 37 =
13. 13.Do the 1089 trick with 936: reverse and subtract, then reverse that answer and add. What do you get?
14. 14.16 × 4 =
15. 15.12 × 9 + 3 =
16. 16.57?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Double 36 =
18. 18.9 × 7 = 6? — what is the missing digit?
19. 19.Magic trick! Think of 7. Double it, add 10, halve it, then take away 7. What number do you get?
20. 20.Take 964. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.Do the 1089 trick with 177: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.The ages of two twins add up to 10. How old is each twin?
23. 23.Do the 1089 trick with 513: reverse and subtract, then reverse that answer and add. What do you get?
24. 24.I thought of a number, multiplied it by 2 and added 4. I got 20. What was my number?
25. 25.A piggy bank has 6 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
26. 26.Do the 1089 trick with 725: reverse and subtract, then reverse that answer and add. What do you get?
27. 27.536 × 10 =
28. 28.1 + 2 + 3 + … + 53 =
29. 29.20 × ? = 20000
30. 30.17 × ? = 170
31. 31.297 + 792 =
32. 32.?989 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Double 16 =
34. 34.Magic square (every row, column and diagonal has the same total): ? 22 20 | 26 18 10 | 16 14 24. What is the missing number?
35. 35.1 + 2 + 3 + … + 99 =
36. 36.Take 76 and take away the sum of its digits. What do you get?
37. 37.1 + 2 + 3 + … + 19 =
38. 38.308 × 10 =
39. 39.9 × 5 = 4? — what is the missing digit?
40. 40.Magic square (every row, column and diagonal has the same total): 17 3 13 | 7 11 15 | 9 19 ?. What is the missing number?

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