Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 958 · 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: 260 + 248 = 508. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 770 + 314 = 1084. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 98 × 93 = 9107. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 74 × 18 = 1338. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 94 × 77 = 7238. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 907 + 146 = 1048. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 710 + 601 = 1304. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 332 + 758 = 1089. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 185 + 616 = 801. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 55 × 62 = 3410. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 310 + 369 = 687. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 18 × 96 = 1731. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 39 × 34 = 1320. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 774 + 592 = 1367. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 33 × 38 = 1254. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 992 + 481 = 1469. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 28 × 91 = 2554. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 99 × 94 = 9306. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 919 + 404 = 1315. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 304 + 382 = 686. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 742 + 962 = 1697. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 60 × 67 = 4018. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 77 × 87 = 6705. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 258 + 263 = 517. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 23 × 22 = 506. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 68 × 15 = 1026. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 564 + 925 = 1492. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 421 + 135 = 560. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 33 × 85 = 2805. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 84 × 48 = 4024. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 42 × 81 = 3399. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 682 + 376 = 1058. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 21 × 93 = 1950. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 59 × 14 = 826. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 74 × 67 = 4958. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 98 × 71 = 6958. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 80 × 62 = 4960. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 448 + 494 = 942. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 391 + 186 = 569. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 386 + 486 = 872. Correct or wrong? (a) wrong (b) correct

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