Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 16 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 535 + 323 = 858. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 79 × 59 = 4660. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 546 + 936 = 1479. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 59 × 82 = 4834. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 26 × 79 = 2054. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 898 + 969 = 1867. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 17 × 34 = 578. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 985 + 263 = 1248. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 88 × 14 = 1232. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 538 + 706 = 1244. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 64 × 80 = 5127. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 67 × 17 = 1139. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 83 × 82 = 6813. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 352 + 976 = 1328. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 20 × 47 = 940. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 335 + 511 = 849. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 853 + 818 = 1671. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 646 + 717 = 1362. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 66 × 97 = 6405. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 978 + 942 = 1923. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 496 + 656 = 1152. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 826 + 138 = 964. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 638 + 273 = 911. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 594 + 552 = 1150. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 353 + 281 = 630. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 94 × 73 = 6866. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 264 + 252 = 516. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 405 + 695 = 1100. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 48 × 24 = 1155. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 530 + 600 = 1122. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 479 + 837 = 1315. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 314 + 408 = 722. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 90 × 32 = 2885. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 41 × 79 = 3239. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 615 + 200 = 817. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 970 + 364 = 1339. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 829 + 260 = 1089. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 84 × 41 = 3444. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 50 × 15 = 750. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 760 + 205 = 965. Correct or wrong? (a) wrong (b) correct

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