Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 426 · 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: 361 + 741 = 1104. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 519 + 570 = 1088. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 824 + 377 = 1201. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 797 + 387 = 1184. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 925 + 731 = 1656. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 17 × 27 = 463. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 36 × 30 = 1080. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 20 = 840. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 29 × 87 = 2523. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 765 + 228 = 998. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 649 + 650 = 1299. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 159 + 844 = 995. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 93 × 50 = 4647. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 38 = 1138. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 970 + 693 = 1663. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 33 = 1089. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 48 × 95 = 4560. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 23 × 58 = 1331. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 14 × 45 = 630. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 269 + 937 = 1206. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 58 × 41 = 2377. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 36 × 31 = 1124. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 74 × 66 = 4884. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 993 + 721 = 1712. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 41 × 58 = 2378. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 31 × 98 = 3041. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 609 + 149 = 751. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 746 + 781 = 1527. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 233 + 277 = 510. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 246 + 339 = 585. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 20 × 70 = 1404. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 91 × 78 = 7098. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 99 × 78 = 7722. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 62 = 5216. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 89 × 25 = 2225. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 66 × 54 = 3564. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 27 × 32 = 867. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 78 × 41 = 3199. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 45 × 23 = 1030. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 356 + 271 = 626. Correct or wrong? (a) correct (b) wrong

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