Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 294 · 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: 501 + 772 = 1281. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 305 + 340 = 653. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 51 × 18 = 919. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 51 × 15 = 765. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 783 + 477 = 1259. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 617 + 867 = 1484. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 364 + 192 = 560. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 87 × 57 = 4965. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 647 + 858 = 1508. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 59 × 26 = 1534. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 89 × 71 = 6316. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 226 + 273 = 494. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 21 × 19 = 406. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 811 + 901 = 1709. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 689 + 326 = 1015. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 79 × 99 = 7820. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 13 × 24 = 311. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 419 + 934 = 1345. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 418 + 540 = 958. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 17 × 93 = 1582. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 32 × 19 = 615. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 478 + 794 = 1269. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 64 × 33 = 2112. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 26 × 93 = 2418. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 45 × 17 = 768. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 65 × 54 = 3510. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 65 × 99 = 6435. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 99 × 41 = 4059. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 743 + 851 = 1594. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 899 + 971 = 1870. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 75 × 43 = 3233. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 27 × 80 = 2164. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 94 × 12 = 1126. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 85 × 44 = 3743. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 551 + 137 = 688. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 17 × 99 = 1683. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 801 + 413 = 1220. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 13 × 70 = 910. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 95 × 97 = 9215. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 436 + 656 = 1095. Correct or wrong? (a) correct (b) wrong

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