Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 893 · 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: 47 × 30 = 1412. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 80 × 60 = 4800. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 62 × 66 = 4092. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 245 + 987 = 1230. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 611 + 795 = 1398. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 87 × 15 = 1305. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 90 × 19 = 1710. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 437 + 209 = 646. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 18 × 82 = 1476. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 32 × 28 = 896. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 548 + 241 = 789. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 288 + 414 = 699. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 82 × 42 = 3437. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 353 + 394 = 740. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 46 × 46 = 2116. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 98 × 62 = 6076. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 401 + 949 = 1352. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 233 + 269 = 501. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 56 × 48 = 2688. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 66 × 41 = 2706. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 73 × 69 = 5037. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 787 + 639 = 1426. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 60 × 98 = 5875. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 422 + 639 = 1069. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 787 + 808 = 1595. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 46 × 67 = 3088. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 89 = 1519. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 70 = 1405. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 636 + 573 = 1205. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 494 + 842 = 1336. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 91 × 93 = 8468. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 12 × 98 = 1176. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 254 + 749 = 1010. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 421 + 765 = 1193. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 506 + 751 = 1254. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 416 + 832 = 1248. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 395 + 418 = 819. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 42 × 32 = 1346. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 636 + 667 = 1303. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 29 × 32 = 928. Correct or wrong? (a) wrong (b) correct

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