Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 903 · 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: 823 + 956 = 1786. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 999 + 842 = 1837. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 614 + 717 = 1334. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 98 × 83 = 8128. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 636 + 201 = 840. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 651 + 435 = 1086. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 246 + 357 = 596. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 825 + 450 = 1275. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 26 × 19 = 500. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 13 × 98 = 1282. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 66 × 55 = 3629. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 27 × 81 = 2187. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 87 = 5398. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 148 + 212 = 360. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 18 × 99 = 1786. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 65 = 1755. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 647 + 389 = 1036. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 209 + 323 = 530. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 18 × 52 = 928. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 61 × 18 = 1098. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 76 × 69 = 5250. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 274 + 198 = 474. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 523 + 128 = 650. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 75 × 48 = 3601. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 19 × 34 = 646. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 872 + 192 = 1070. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 569 + 237 = 804. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 704 + 677 = 1381. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 764 + 360 = 1130. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 202 + 212 = 407. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 74 × 54 = 3996. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 359 + 326 = 685. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 756 + 361 = 1117. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 752 + 757 = 1506. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 62 × 18 = 1116. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 948 + 683 = 1629. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 319 + 299 = 618. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 86 × 61 = 5246. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 304 + 536 = 845. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 615 + 537 = 1152. Correct or wrong? (a) correct (b) wrong

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