Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 733 · 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: 176 + 752 = 928. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 23 × 18 = 414. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 467 + 440 = 907. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 48 × 48 = 2304. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 403 + 270 = 681. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 34 × 48 = 1632. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 21 × 27 = 572. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 222 + 229 = 443. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 602 + 376 = 976. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 59 × 46 = 2715. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 30 × 88 = 2644. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 491 + 667 = 1158. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 90 × 33 = 2970. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 718 + 730 = 1448. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 286 + 340 = 626. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 418 + 765 = 1183. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 676 + 846 = 1525. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 808 + 337 = 1145. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 833 + 606 = 1439. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 45 × 83 = 3728. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 275 + 388 = 663. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 646 + 937 = 1576. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 84 × 76 = 6382. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 266 + 588 = 862. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 81 × 17 = 1381. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 93 × 13 = 1211. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 393 + 246 = 638. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 687 + 898 = 1585. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 47 × 25 = 1174. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 13 × 83 = 1085. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 64 × 29 = 1859. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 332 + 609 = 941. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 15 × 50 = 750. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 990 + 472 = 1462. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 549 + 194 = 741. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 14 = 910. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 520 + 563 = 1077. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 18 × 18 = 324. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 16 × 70 = 1115. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 69 × 84 = 5794. Correct or wrong? (a) correct (b) wrong

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