Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 232 · 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: 62 × 70 = 4340. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 23 × 99 = 2277. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 843 + 363 = 1206. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 16 = 608. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 140 + 125 = 265. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 991 + 967 = 1963. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 44 = 1848. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 250 + 742 = 992. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 82 × 16 = 1318. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 98 × 24 = 2352. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 869 + 695 = 1565. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 95 × 93 = 8835. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 774 + 135 = 909. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 254 + 153 = 407. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 854 + 999 = 1853. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 665 + 793 = 1458. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 94 × 69 = 6486. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 51 × 19 = 968. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 293 + 214 = 507. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 912 + 211 = 1123. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 44 × 28 = 1232. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 40 × 28 = 1120. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 16 × 35 = 560. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 79 × 71 = 5609. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 391 + 748 = 1147. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 446 + 555 = 1004. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 77 × 85 = 6540. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 476 + 379 = 855. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 65 × 80 = 5208. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 53 × 28 = 1484. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 760 + 761 = 1518. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 92 × 15 = 1380. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 99 × 29 = 2872. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 542 + 292 = 835. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 57 × 29 = 1647. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 47 × 35 = 1645. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 338 + 397 = 735. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 54 × 30 = 1620. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 183 + 996 = 1179. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 281 + 630 = 917. Correct or wrong? (a) wrong (b) correct

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