Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 304 · 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: 314 + 626 = 942. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 825 + 704 = 1529. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 17 × 63 = 1071. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 98 × 79 = 7742. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 94 × 21 = 1981. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 215 + 244 = 459. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 989 + 295 = 1284. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 34 × 50 = 1700. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 17 × 72 = 1219. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 572 + 883 = 1455. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 27 × 29 = 783. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 924 + 184 = 1111. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 24 × 65 = 1563. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 57 × 40 = 2286. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 152 + 859 = 1015. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 135 + 695 = 835. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 242 + 236 = 486. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 156 + 316 = 472. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 49 × 66 = 3234. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 25 × 95 = 2380. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 51 × 12 = 604. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 402 + 209 = 611. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 55 × 15 = 833. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 43 × 42 = 1807. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 858 + 880 = 1738. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 984 + 191 = 1174. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 355 + 547 = 898. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 56 × 23 = 1287. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 23 × 39 = 897. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 349 + 755 = 1103. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 72 × 24 = 1733. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 742 + 148 = 890. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 982 + 511 = 1501. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 397 + 713 = 1110. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 56 × 90 = 5040. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 724 + 229 = 953. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 899 + 120 = 1023. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 41 × 31 = 1270. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 998 + 848 = 1846. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 921 + 533 = 1454. Correct or wrong? (a) correct (b) wrong

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