Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 738 · 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: 696 + 675 = 1379. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 192 + 141 = 333. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 42 × 99 = 4151. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 229 + 814 = 1043. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 52 × 62 = 3219. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 170 + 640 = 810. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 42 × 69 = 2898. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 903 + 755 = 1658. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 791 + 853 = 1644. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 152 + 186 = 342. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 178 + 652 = 824. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 123 + 952 = 1075. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 59 × 35 = 2066. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 314 + 485 = 806. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 88 × 96 = 8450. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 64 × 52 = 3329. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 354 + 592 = 944. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 19 × 51 = 972. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 21 × 63 = 1323. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 93 × 94 = 8743. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 59 × 90 = 5310. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 799 + 341 = 1140. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 202 + 685 = 891. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 138 + 123 = 257. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 472 + 841 = 1313. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 25 × 62 = 1550. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 21 × 29 = 611. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 924 + 258 = 1182. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 306 + 787 = 1093. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 256 + 926 = 1184. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 870 + 918 = 1788. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 43 × 16 = 688. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 55 × 17 = 935. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 16 × 81 = 1296. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 907 + 967 = 1874. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 929 + 573 = 1502. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 277 + 965 = 1242. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 887 + 211 = 1098. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 15 × 67 = 1001. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 911 + 298 = 1211. Correct or wrong? (a) wrong (b) correct

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