Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 683 · 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 × 9 =
2. 2.In 2 years a boy will be 13 years old. How old was he 4 years ago?
3. 3.Do the 1089 trick with 690: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.18 × 4 =
5. 5.9 × 2 = ?8 — what is the missing digit?
6. 6.19? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.9 × 2 = 1? — what is the missing digit?
8. 8.Take 479. Reverse its digits and take the smaller number away from the bigger one. What do you get?
9. 9.A piggy bank has 11 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
10. 10.11 × 11 =
11. 11.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 12 (d) 16
12. 12.I thought of a number, added 6 and then doubled it. I got 20. What was my number?
13. 13.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 15 | 17 3 ?. What is the missing number?
14. 14.37 × 3 =
15. 15.Magic square (every row, column and diagonal has the same total): 17 19 9 | 7 15 ? | 21 11 13. What is the missing number?
16. 16.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
17. 17.9 × 3 =
18. 18.Double 84 =
19. 19.25 × 4 =
20. 20.Magic square (every row, column and diagonal has the same total): 28 7 22 | 13 19 25 | 16 ? 10. What is the missing number?
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
22. 22.958 × 10 =
23. 23.9 × 6 = ?4 — what is the missing digit?
24. 24.23 × 4 =
25. 25.Take 75 and take away the sum of its digits. What do you get?
26. 26.1 + 2 + 3 + … + 59 =
27. 27.9 × 9 =
28. 28.1 × 9 =
29. 29.40 × 4 =
30. 30.The ages of two twins add up to 20. How old is each twin?
31. 31.If today is Monday, what day was it 30 days ago? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
32. 32.30 × 4 =
33. 33.A father is 33 years old and his son is 14. How old was the father when the son was born?
34. 34.Double 75 =
35. 35.50 × 4 =
36. 36.Take 14 and take away the sum of its digits. What do you get?
37. 37.344 × ? = 3440
38. 38.?354 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.6?58 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.If today is Saturday, what day was it 16 days ago? (a) Wednesday (b) Thursday (c) Sunday (d) Friday

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