Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 839 · 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: 929 + 190 = 1123. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 57 × 80 = 4559. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 976 + 325 = 1301. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 720 + 350 = 1070. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 77 × 90 = 6938. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 140 + 297 = 437. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 87 × 67 = 5829. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 939 + 847 = 1786. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 57 × 20 = 1140. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 422 + 835 = 1265. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 93 × 19 = 1767. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 167 + 760 = 927. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 725 + 547 = 1272. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 595 + 755 = 1350. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 483 + 167 = 650. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 74 × 13 = 962. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 294 + 450 = 747. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 427 + 482 = 913. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 924 + 420 = 1344. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 77 × 39 = 3003. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 616 + 546 = 1168. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 565 + 749 = 1314. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 660 + 788 = 1448. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 273 + 321 = 592. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 559 + 690 = 1249. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 620 + 653 = 1268. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 92 × 26 = 2392. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 289 + 959 = 1248. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 688 + 731 = 1419. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 88 × 65 = 5720. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 78 × 18 = 1404. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 91 × 69 = 6279. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 64 × 67 = 4294. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 17 × 43 = 731. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 25 × 18 = 450. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 243 + 489 = 732. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 96 × 23 = 2208. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 36 × 68 = 2454. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 745 + 828 = 1578. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 941 + 412 = 1353. Correct or wrong? (a) wrong (b) correct

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