Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 877 · 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 28 and take away the sum of its digits. What do you get?
2. 2.Take 16 and take away the sum of its digits. What do you get?
3. 3.?550 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 98 and take away the sum of its digits. What do you get?
5. 5.Take 92 and take away the sum of its digits. What do you get?
6. 6.Take 91 and take away the sum of its digits. What do you get?
7. 7.Take 52 and take away the sum of its digits. What do you get?
8. 8.Take 95 and take away the sum of its digits. What do you get?
9. 9.Take 60 and take away the sum of its digits. What do you get?
10. 10.?979 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 50 and take away the sum of its digits. What do you get?
12. 12.2?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.44? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.Take 82 and take away the sum of its digits. What do you get?
15. 15.?277 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.?742 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.196? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 37 and take away the sum of its digits. What do you get?
19. 19.Take 83 and take away the sum of its digits. What do you get?
20. 20.12?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.?834 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 43 and take away the sum of its digits. What do you get?
23. 23.3?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 11 and take away the sum of its digits. What do you get?
25. 25.Take 76 and take away the sum of its digits. What do you get?
26. 26.88?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.62?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 80 and take away the sum of its digits. What do you get?
29. 29.503? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.6?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 45 and take away the sum of its digits. What do you get?
32. 32.Take 87 and take away the sum of its digits. What do you get?
33. 33.?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.478? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.5?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.35?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.60?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.?847 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 29 and take away the sum of its digits. What do you get?
40. 40.79?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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