Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 871 · 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: 23 × 67 = 1534. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 206 + 464 = 677. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 41 × 28 = 1148. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 330 + 698 = 1028. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 24 × 70 = 1679. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 616 + 545 = 1159. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 61 × 96 = 5852. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 488 + 692 = 1180. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 60 × 89 = 5340. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 639 + 730 = 1369. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 24 × 43 = 1032. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 252 + 644 = 893. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 607 + 717 = 1324. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 998 + 717 = 1710. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 140 + 574 = 707. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 86 = 1376. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 124 + 499 = 623. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 621 + 408 = 1032. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 75 × 13 = 980. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 824 + 426 = 1248. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 209 + 166 = 375. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 774 + 238 = 1012. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 15 = 570. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 618 + 297 = 915. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 544 + 277 = 829. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 516 + 722 = 1240. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 777 + 187 = 964. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 915 + 420 = 1335. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 56 × 23 = 1288. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 19 × 61 = 1159. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 847 + 640 = 1487. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 255 + 453 = 715. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 131 + 484 = 615. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 50 × 47 = 2344. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 617 + 297 = 914. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 92 × 40 = 3680. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 22 × 60 = 1320. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 870 + 907 = 1777. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 78 × 45 = 3510. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 85 × 18 = 1530. Correct or wrong? (a) wrong (b) correct

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