Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 762 · 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: 13 × 81 = 1061. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 512 + 794 = 1301. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 671 + 221 = 891. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 18 × 72 = 1296. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 74 × 74 = 5469. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 622 + 580 = 1202. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 529 + 684 = 1206. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 160 + 251 = 411. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 63 × 37 = 2331. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 997 + 967 = 1958. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 96 × 58 = 5571. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 86 × 55 = 4725. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 79 = 6320. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 73 × 32 = 2336. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 31 × 70 = 2173. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 91 × 79 = 7193. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 515 + 615 = 1134. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 689 + 662 = 1351. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 82 × 15 = 1230. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 12 × 60 = 717. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 24 × 87 = 2088. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 721 + 637 = 1358. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 736 + 712 = 1448. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 47 × 12 = 564. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 487 + 955 = 1442. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 272 + 445 = 720. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 190 + 547 = 737. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 12 × 18 = 216. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 13 × 72 = 936. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 63 × 83 = 5229. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 139 + 252 = 390. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 471 + 483 = 954. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 251 + 255 = 506. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 256 + 387 = 643. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 388 + 970 = 1356. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 368 + 598 = 966. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 897 + 363 = 1254. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 32 × 70 = 2240. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 28 × 44 = 1232. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 894 + 258 = 1152. Correct or wrong? (a) wrong (b) correct

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