Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 378 · 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: 147 + 694 = 841. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 84 × 65 = 5460. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 25 × 45 = 1125. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 31 = 1176. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 304 + 877 = 1175. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 606 + 853 = 1453. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 17 × 56 = 952. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 518 + 187 = 705. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 353 + 781 = 1128. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 27 × 64 = 1731. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 44 × 47 = 2068. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 97 × 22 = 2139. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 17 × 96 = 1637. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 22 × 44 = 968. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 903 + 285 = 1181. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 442 + 867 = 1309. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 668 + 796 = 1460. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 643 + 442 = 1085. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 160 + 184 = 344. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 863 + 337 = 1200. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 41 × 65 = 2664. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 603 + 278 = 881. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 739 + 124 = 863. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 71 × 84 = 5961. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 55 × 88 = 4833. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 796 + 652 = 1448. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 428 + 341 = 769. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 827 + 786 = 1613. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 29 × 27 = 785. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 54 × 68 = 3671. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 769 + 571 = 1341. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 40 × 18 = 720. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 975 + 511 = 1486. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 238 + 933 = 1172. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 877 + 161 = 1038. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 463 + 308 = 771. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 47 × 21 = 989. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 315 + 413 = 728. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 60 × 29 = 1738. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 410 + 885 = 1302. Correct or wrong? (a) wrong (b) correct

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