Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 789 · 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: 440 + 514 = 961. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 900 + 228 = 1126. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 896 + 569 = 1471. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 434 + 416 = 850. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 421 + 756 = 1180. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 56 × 20 = 1124. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 38 × 19 = 722. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 260 + 528 = 789. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 49 × 20 = 973. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 224 + 521 = 745. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 882 + 490 = 1366. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 36 × 32 = 1147. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 17 × 13 = 222. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 12 × 63 = 759. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 960 + 456 = 1413. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 278 + 464 = 742. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 19 × 37 = 703. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 916 + 522 = 1443. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 23 × 92 = 2116. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 64 × 36 = 2304. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 465 + 225 = 690. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 459 + 786 = 1245. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 32 × 73 = 2336. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 931 + 329 = 1260. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 94 × 12 = 1128. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 998 + 212 = 1210. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 472 + 869 = 1346. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 80 × 87 = 6960. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 99 × 52 = 5148. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 785 + 122 = 911. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 345 + 474 = 813. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 38 × 90 = 3425. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 959 + 140 = 1099. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 13 × 70 = 910. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 68 × 96 = 6522. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 688 + 581 = 1269. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 323 + 675 = 998. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 44 × 56 = 2464. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 44 × 69 = 3036. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 72 × 20 = 1440. Correct or wrong? (a) correct (b) wrong

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