Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 11 · 40 questions

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

1. 1.Take 75 and take away the sum of its digits. What do you get?
2. 2.Take 46 and take away the sum of its digits. What do you get?
3. 3.Take 24 and take away the sum of its digits. What do you get?
4. 4.?784 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 95 and take away the sum of its digits. What do you get?
6. 6.Take 33 and take away the sum of its digits. What do you get?
7. 7.Take 87 and take away the sum of its digits. What do you get?
8. 8.?688 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.43?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.73?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 74 and take away the sum of its digits. What do you get?
12. 12.223? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 94 and take away the sum of its digits. What do you get?
14. 14.Take 42 and take away the sum of its digits. What do you get?
15. 15.Take 97 and take away the sum of its digits. What do you get?
16. 16.108? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.Take 98 and take away the sum of its digits. What do you get?
18. 18.2?41 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.?426 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.Take 45 and take away the sum of its digits. What do you get?
21. 21.?130 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 72 and take away the sum of its digits. What do you get?
23. 23.Take 35 and take away the sum of its digits. What do you get?
24. 24.?053 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.?002 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.41?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.?313 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.?00 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.2?31 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.18?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.250? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 52 and take away the sum of its digits. What do you get?
33. 33.16?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.?560 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 99 and take away the sum of its digits. What do you get?
36. 36.16?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.29?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.39?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 15 and take away the sum of its digits. What do you get?
40. 40.Take 84 and take away the sum of its digits. What do you get?

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