Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 144 · 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: 461 + 722 = 1183. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 99 × 55 = 5445. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 58 × 96 = 5574. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 172 + 185 = 357. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 40 × 60 = 2400. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 58 × 40 = 2320. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 54 × 13 = 702. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 319 + 438 = 757. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 444 + 861 = 1305. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 606 + 850 = 1456. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 480 + 610 = 1097. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 477 + 758 = 1235. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 19 × 75 = 1430. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 397 + 360 = 757. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 18 × 80 = 1436. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 38 = 3268. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 93 × 24 = 2232. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 48 = 4697. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 865 + 400 = 1265. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 15 × 68 = 1012. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 650 + 720 = 1373. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 432 + 531 = 963. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 167 + 123 = 290. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 62 × 36 = 2232. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 18 × 46 = 828. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 95 × 82 = 7793. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 612 + 271 = 879. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 12 × 24 = 288. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 95 × 42 = 3990. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 34 × 31 = 1054. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 38 × 59 = 2242. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 22 × 20 = 440. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 45 × 69 = 3105. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 80 × 67 = 5354. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 53 × 57 = 3019. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 48 × 60 = 2886. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 294 + 663 = 964. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 144 + 349 = 495. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 26 × 53 = 1385. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 530 + 434 = 964. Correct or wrong? (a) correct (b) wrong

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