Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 753 · 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: 453 + 150 = 599. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 910 + 584 = 1494. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 87 × 92 = 8000. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 92 × 36 = 3312. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 39 × 52 = 2028. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 88 × 88 = 7744. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 876 + 649 = 1525. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 250 + 381 = 624. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 67 = 804. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 543 + 626 = 1167. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 711 + 402 = 1113. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 61 × 74 = 4514. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 542 + 808 = 1350. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 447 + 557 = 1005. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 219 + 854 = 1073. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 68 × 60 = 4080. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 139 + 573 = 711. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 81 × 81 = 6561. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 16 × 97 = 1552. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 23 × 62 = 1428. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 53 × 26 = 1378. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 894 + 356 = 1252. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 27 × 22 = 597. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 870 + 709 = 1579. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 98 × 43 = 4214. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 854 + 903 = 1761. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 99 × 67 = 6640. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 67 × 28 = 1868. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 42 × 30 = 1260. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 911 + 320 = 1238. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 630 + 455 = 1085. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 53 = 1431. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 16 × 78 = 1240. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 586 + 780 = 1359. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 87 × 56 = 4872. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 660 + 268 = 923. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 42 × 78 = 3269. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 19 × 17 = 323. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 41 × 30 = 1230. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 369 + 428 = 791. Correct or wrong? (a) wrong (b) correct

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