Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 831 · 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: 94 × 23 = 2162. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 535 + 486 = 1025. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 914 + 239 = 1153. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 915 + 502 = 1424. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 94 × 94 = 8843. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 14 × 42 = 588. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 498 + 345 = 843. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 664 + 685 = 1349. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 46 × 14 = 644. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 609 + 836 = 1440. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 954 + 365 = 1319. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 868 + 395 = 1263. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 55 × 77 = 4235. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 316 + 619 = 935. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 279 + 151 = 438. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 557 + 659 = 1223. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 82 × 66 = 5412. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 794 + 778 = 1572. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 12 × 61 = 732. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 961 + 644 = 1603. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 52 × 60 = 3120. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 51 × 28 = 1425. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 173 + 183 = 357. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 14 × 99 = 1386. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 81 × 48 = 3888. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 80 × 22 = 1760. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 249 + 602 = 856. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 32 × 31 = 997. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 448 + 583 = 1031. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 163 + 275 = 434. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 82 × 48 = 3938. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 59 = 1298. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 775 + 170 = 950. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 281 + 872 = 1155. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 40 × 71 = 2840. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 731 + 898 = 1629. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 810 + 905 = 1715. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 57 × 59 = 3364. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 734 + 379 = 1113. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 192 + 543 = 735. Correct or wrong? (a) wrong (b) correct

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