Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 212 · 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: 80 × 33 = 2639. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 61 × 70 = 4270. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 282 + 947 = 1225. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 518 + 426 = 951. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 948 + 881 = 1835. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 47 × 74 = 3478. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 58 × 15 = 870. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 42 × 20 = 840. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 756 + 924 = 1685. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 343 + 592 = 935. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 470 + 260 = 730. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 926 + 423 = 1349. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 17 × 67 = 1133. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 389 + 648 = 1037. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 443 + 407 = 844. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 295 + 364 = 654. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 606 + 712 = 1318. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 69 × 42 = 2893. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 633 + 998 = 1634. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 70 × 68 = 4760. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 67 × 93 = 6231. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 85 × 67 = 5700. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 346 + 824 = 1170. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 481 + 901 = 1382. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 668 + 410 = 1072. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 27 × 14 = 374. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 586 + 156 = 742. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 935 + 349 = 1292. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 40 × 39 = 1558. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 657 + 136 = 793. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 174 + 264 = 443. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 69 × 27 = 1867. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 933 + 748 = 1681. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 97 × 85 = 8245. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 385 + 851 = 1234. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 20 × 17 = 348. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 257 + 271 = 520. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 615 + 574 = 1181. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 288 + 281 = 570. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 23 × 96 = 2209. Correct or wrong? (a) correct (b) wrong

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