Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 31 · 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: 435 + 306 = 741. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 39 × 97 = 3777. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 969 + 489 = 1456. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 842 + 185 = 1027. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 98 × 19 = 1864. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 45 × 34 = 1532. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 55 × 24 = 1320. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 964 + 277 = 1241. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 923 + 363 = 1286. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 63 × 30 = 1890. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 13 × 83 = 1079. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 78 × 54 = 4207. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 402 + 562 = 964. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 165 + 753 = 920. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 56 × 34 = 1904. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 309 + 650 = 961. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 21 × 13 = 273. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 253 + 202 = 455. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 40 × 34 = 1360. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 557 + 427 = 978. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 75 × 18 = 1350. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 751 + 567 = 1318. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 66 × 94 = 6198. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 34 × 43 = 1462. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 971 + 752 = 1724. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 311 + 995 = 1299. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 756 + 813 = 1565. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 324 + 250 = 572. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 139 + 310 = 449. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 505 + 196 = 706. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 542 + 131 = 671. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 32 × 23 = 736. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 39 × 27 = 1047. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 62 × 52 = 3229. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 42 × 41 = 1722. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 879 + 695 = 1575. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 511 + 738 = 1245. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 469 + 994 = 1456. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 278 + 127 = 405. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 935 + 488 = 1428. Correct or wrong? (a) correct (b) wrong

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