Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 980 · 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 × 9 = 8? — what is the missing digit?
2. 2.Double 46 =
3. 3.7 × 9 =
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
5. 5.48 × 4 =
6. 6.1111 × 1111 =
7. 7.Magic square (every row, column and diagonal has the same total): 21 24 9 | 6 18 ? | 27 12 15. What is the missing number?
8. 8.2 × 9 =
9. 9.If today is Tuesday, what day was it 51 days ago? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
10. 10.1 + 2 + 3 + … + 100 =
11. 11.43 × ? = 4300
12. 12.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
13. 13.1234 × 8 + 4 =
14. 14.134 × 10 =
15. 15.Take 16 and take away the sum of its digits. What do you get?
16. 16.If today is Thursday, what day was it 13 days ago? (a) Friday (b) Thursday (c) Saturday (d) Monday
17. 17.90 × ? = 900
18. 18.Double 86 =
19. 19.9 × 8 =
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
21. 21.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 11 15 | ? 13 8. What is the missing number?
22. 22.8 × 9 =
23. 23.9 × 5 = ?5 — what is the missing digit?
24. 24.Odd one out: which number is NOT in the 4 times table? (a) 8 (b) 20 (c) 32 (d) 21
25. 25.29 × 4 =
26. 26.Do the 1089 trick with 410: reverse and subtract, then reverse that answer and add. What do you get?
27. 27.38 × 4 =
28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
29. 29.9 × 4 = ?6 — what is the missing digit?
30. 30.If today is Monday, what day will it be after 11 days? (a) Friday (b) Saturday (c) Thursday (d) Monday
31. 31.Half of 132 =
32. 32.Take 29 and take away the sum of its digits. What do you get?
33. 33.9 × 6 = ?4 — what is the missing digit?
34. 34.1 + 2 + 3 + … + 93 =
35. 35.Magic square (every row, column and diagonal has the same total): 13 12 ? | 18 14 10 | 11 16 15. What is the missing number?
36. 36.Magic square (every row, column and diagonal has the same total): 17 7 21 | 19 15 11 | ? 23 13. What is the missing number?
37. 37.If today is Friday, what day will it be after 57 days? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
38. 38.Magic square (every row, column and diagonal has the same total): 12 17 10 | ? 13 15 | 16 9 14. What is the missing number?
39. 39.I thought of a number, added 5 and then doubled it. I got 20. What was my number?
40. 40.1234 × 9 + 5 =

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