Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 797 · 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: 371 + 523 = 892. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 479 + 835 = 1306. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 447 + 825 = 1272. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 43 × 70 = 3006. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 39 × 95 = 3704. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 854 + 320 = 1174. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 44 × 16 = 704. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 13 × 93 = 1209. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 693 + 178 = 871. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 13 × 72 = 943. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 199 + 616 = 815. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 59 = 5842. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 72 × 24 = 1724. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 866 + 151 = 1017. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 52 × 59 = 3068. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 29 × 58 = 1682. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 724 + 704 = 1428. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 82 × 13 = 1063. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 43 × 65 = 2795. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 319 + 920 = 1237. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 926 + 793 = 1719. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 88 × 90 = 7921. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 37 × 49 = 1819. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 48 × 27 = 1296. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 43 × 60 = 2580. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 149 + 885 = 1037. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 193 + 355 = 548. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 54 × 22 = 1188. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 649 + 493 = 1142. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 325 + 221 = 546. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 933 + 631 = 1564. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 519 + 162 = 682. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 98 × 62 = 6076. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 218 + 812 = 1030. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 89 × 61 = 5432. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 33 × 15 = 494. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 637 + 892 = 1531. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 48 × 80 = 3840. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 72 × 46 = 3312. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 449 + 496 = 946. Correct or wrong? (a) wrong (b) correct

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