Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 143 · 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. 1.1 + 3 + 5 + … + 13 =
2. 2.I thought of a number, added 3 and then doubled it. I got 32. What was my number?
3. 3.9 × 10 = 9? — what is the missing digit?
4. 4.34 × 4 =
5. 5.Magic square (every row, column and diagonal has the same total): ? 8 13 | 10 12 14 | 11 16 9. What is the missing number?
6. 6.Half of 62 =
7. 7.Half of 194 =
8. 8.A girl is 6 years old and her brother is 6 years older. How old will her brother be in 7 years?
9. 9.A girl is 9 years old and her brother is 6 years older. How old will her brother be in 8 years?
10. 10.26 × 4 =
11. 11.29 × 4 =
12. 12.5 × 9 =
13. 13.If today is Monday, what day was it 26 days ago? (a) Wednesday (b) Thursday (c) Tuesday (d) Saturday
14. 14.Magic trick! Think of 19. Double it, add 12, halve it, then take away 19. What number do you get?
15. 15.40 × ? = 40000
16. 16.396 + 693 =
17. 17.68?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.111111 × 111111 =
19. 19.1?05 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.?370 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.A piggy bank has 9 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
22. 22.42 × 1000 =
23. 23.The 6th of a month is a Tuesday. What day is the 15th of the same month? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
24. 24.9 × 5 = ?5 — what is the missing digit?
25. 25.A piggy bank has 2 coins of ₹5 and 8 coins of ₹2. How many rupees are in it?
26. 26.15 × ? = 150
27. 27.Double 76 =
28. 28.1 × 9 =
29. 29.114 × 10 =
30. 30.Double 12 =
31. 31.The 2nd of a month is a Friday. What day is the 26th of the same month? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
32. 32.123 × 9 + 4 =
33. 33.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 25 (c) 10 (d) 28
34. 34.14 × 4 =
35. 35.Magic square (every row, column and diagonal has the same total): 22 7 28 | 25 19 13 | 10 31 ?. What is the missing number?
36. 36.If today is Tuesday, what day was it 54 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
38. 38.The 4th of a month is a Sunday. What day is the 12th of the same month? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
39. 39.14 × ? = 14000
40. 40.9 × 6 = 5? — what is the missing digit?

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