Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 989 · 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: 190 + 718 = 912. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 574 + 807 = 1381. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 611 + 316 = 934. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 12 × 26 = 312. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 88 × 95 = 8360. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 38 × 51 = 1930. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 14 × 99 = 1386. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 33 × 69 = 2275. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 71 × 90 = 6386. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 700 + 541 = 1241. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 85 × 15 = 1275. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 199 + 690 = 889. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 49 × 95 = 4657. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 721 + 853 = 1566. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 454 + 314 = 764. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 24 × 23 = 546. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 30 × 69 = 2070. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 256 + 479 = 732. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 293 + 949 = 1234. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 54 × 49 = 2646. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 78 × 18 = 1403. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 854 + 207 = 1061. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 41 × 54 = 2208. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 18 × 84 = 1519. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 228 + 683 = 911. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 248 + 535 = 779. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 979 + 885 = 1864. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 534 + 832 = 1366. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 19 × 82 = 1555. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 99 × 45 = 4457. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 35 = 980. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 633 + 570 = 1196. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 604 + 310 = 914. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 88 × 81 = 7131. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 940 + 134 = 1069. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 367 + 287 = 654. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 816 + 976 = 1792. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 33 × 40 = 1320. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 252 + 828 = 1083. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 298 + 626 = 924. Correct or wrong? (a) correct (b) wrong

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