Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 417 · 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: 131 + 999 = 1134. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 93 × 88 = 8184. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 88 = 7752. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 98 × 70 = 6862. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 207 + 858 = 1065. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 307 + 769 = 1076. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 81 × 77 = 6242. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 839 + 357 = 1196. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 29 × 67 = 1946. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 825 + 672 = 1505. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 167 + 594 = 758. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 36 × 53 = 1908. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 147 + 807 = 954. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 798 + 221 = 1025. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 587 + 233 = 821. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 966 + 941 = 1912. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 35 × 32 = 1120. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 74 × 71 = 5254. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 977 + 636 = 1617. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 431 + 233 = 664. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 596 + 828 = 1424. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 275 + 942 = 1213. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 191 + 543 = 734. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 47 × 82 = 3852. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 197 + 271 = 468. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 325 + 507 = 832. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 19 × 66 = 1254. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 811 + 781 = 1593. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 888 + 476 = 1357. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 975 + 569 = 1544. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 549 + 309 = 857. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 33 × 50 = 1650. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 148 + 710 = 858. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 35 × 53 = 1855. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 308 + 979 = 1286. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 70 × 76 = 5328. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 38 × 59 = 2244. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 51 × 31 = 1588. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 533 + 797 = 1335. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 129 + 872 = 1007. Correct or wrong? (a) correct (b) wrong

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