Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 435 · 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: 406 + 937 = 1343. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 733 + 744 = 1477. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 72 × 19 = 1368. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 215 + 382 = 590. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 62 × 62 = 3845. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 281 + 381 = 657. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 330 + 302 = 640. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 76 × 70 = 5322. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 625 + 842 = 1467. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 37 × 31 = 1142. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 85 × 41 = 3482. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 459 + 816 = 1282. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 54 × 22 = 1188. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 70 × 82 = 5740. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 82 × 30 = 2456. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 16 × 22 = 352. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 352 + 878 = 1237. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 90 × 45 = 4045. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 51 × 41 = 2091. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 25 × 66 = 1657. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 238 + 928 = 1167. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 969 + 407 = 1376. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 41 × 89 = 3649. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 18 × 83 = 1501. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 602 + 670 = 1272. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 68 × 97 = 6602. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 66 × 98 = 6468. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 867 + 190 = 1057. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 215 + 671 = 886. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 18 × 30 = 543. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 772 + 930 = 1702. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 28 × 96 = 2688. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 81 × 25 = 2025. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 14 × 25 = 350. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 865 + 674 = 1539. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 73 × 20 = 1465. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 72 × 19 = 1368. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 76 × 29 = 2203. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 45 × 21 = 946. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 27 × 91 = 2457. Correct or wrong? (a) wrong (b) correct

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