Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 282 · 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: 681 + 545 = 1226. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 43 × 54 = 2319. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 761 + 677 = 1438. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 173 + 806 = 979. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 76 × 76 = 5776. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 43 × 12 = 513. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 964 + 611 = 1575. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 990 + 798 = 1788. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 97 × 53 = 5138. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 842 + 569 = 1409. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 83 × 82 = 6806. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 910 + 347 = 1257. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 196 + 362 = 558. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 79 × 19 = 1497. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 796 + 484 = 1280. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 98 × 74 = 7252. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 85 × 59 = 5015. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 40 × 33 = 1320. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 43 × 54 = 2322. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 79 × 16 = 1267. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 39 × 61 = 2379. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 97 × 53 = 5141. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 82 × 63 = 5172. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 49 × 70 = 3430. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 735 + 586 = 1323. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 76 × 18 = 1365. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 305 + 228 = 533. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 63 × 77 = 4851. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 50 × 46 = 2300. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 33 × 34 = 1129. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 206 + 302 = 514. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 366 + 284 = 650. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 19 × 29 = 559. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 574 + 709 = 1283. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 21 × 71 = 1491. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 198 + 176 = 368. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 20 × 12 = 232. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 96 × 94 = 9028. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 969 + 306 = 1274. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 211 + 361 = 572. Correct or wrong? (a) correct (b) wrong

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