Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 931 · 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: 56 × 79 = 4416. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 943 + 351 = 1294. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 963 + 645 = 1608. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 955 + 236 = 1191. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 300 + 624 = 924. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 767 + 620 = 1382. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 22 × 18 = 396. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 510 + 802 = 1312. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 75 × 83 = 6225. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 163 + 616 = 774. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 723 + 578 = 1305. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 332 + 857 = 1188. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 326 + 887 = 1213. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 295 + 611 = 914. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 61 × 15 = 915. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 54 × 44 = 2376. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 674 + 602 = 1277. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 141 + 249 = 390. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 237 + 281 = 518. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 90 × 96 = 8640. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 530 + 384 = 914. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 37 × 38 = 1410. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 530 + 262 = 790. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 871 + 774 = 1645. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 710 + 272 = 982. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 435 + 289 = 724. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 41 × 15 = 610. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 201 + 292 = 493. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 82 × 41 = 3361. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 95 × 40 = 3800. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 297 + 949 = 1246. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 57 × 36 = 2052. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 588 + 341 = 937. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 85 × 94 = 7990. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 953 + 940 = 1894. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 12 × 37 = 444. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 81 = 3321. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 82 × 50 = 4099. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 61 × 15 = 913. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 838 + 975 = 1812. Correct or wrong? (a) correct (b) wrong

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