Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 592 · 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: 925 + 809 = 1728. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 41 × 58 = 2378. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 94 × 31 = 2914. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 120 + 662 = 782. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 17 × 40 = 680. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 353 + 524 = 874. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 79 × 23 = 1818. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 74 × 18 = 1328. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 25 × 32 = 800. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 615 + 646 = 1261. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 85 × 17 = 1439. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 74 × 28 = 2065. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 338 + 656 = 990. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 763 + 208 = 972. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 42 × 35 = 1467. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 94 × 56 = 5267. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 307 + 980 = 1287. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 28 × 78 = 2176. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 825 + 217 = 1042. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 188 + 327 = 518. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 977 + 154 = 1131. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 27 × 85 = 2302. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 51 × 45 = 2294. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 96 × 22 = 2105. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 428 + 228 = 653. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 385 + 393 = 778. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 173 + 317 = 490. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 99 × 69 = 6835. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 25 × 25 = 627. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 55 × 13 = 723. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 22 × 85 = 1870. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 13 × 45 = 585. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 49 × 24 = 1169. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 752 + 698 = 1450. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 62 × 77 = 4766. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 92 × 76 = 6984. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 13 × 16 = 214. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 28 × 92 = 2571. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 34 × 58 = 1972. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 156 + 966 = 1123. Correct or wrong? (a) correct (b) wrong

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