Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 149 · 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: 538 + 199 = 741. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 210 + 203 = 416. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 25 × 29 = 725. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 68 × 18 = 1224. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 70 × 58 = 4057. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 126 + 602 = 728. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 47 × 73 = 3436. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 882 + 356 = 1238. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 327 + 506 = 833. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 508 + 360 = 862. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 80 × 33 = 2640. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 39 × 21 = 819. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 918 + 382 = 1300. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 848 + 208 = 1056. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 85 × 63 = 5355. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 592 + 174 = 766. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 27 × 24 = 648. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 98 × 83 = 8134. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 671 + 301 = 972. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 65 × 85 = 5525. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 93 × 19 = 1764. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 766 + 356 = 1117. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 628 + 226 = 848. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 698 + 972 = 1670. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 47 × 95 = 4473. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 72 × 91 = 6552. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 88 × 84 = 7392. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 302 + 853 = 1163. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 313 + 363 = 676. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 922 + 597 = 1519. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 95 × 59 = 5599. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 361 + 467 = 827. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 48 = 3360. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 393 + 257 = 643. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 589 + 772 = 1366. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 475 + 876 = 1349. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 812 + 763 = 1575. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 504 + 518 = 1022. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 26 × 19 = 494. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 73 × 64 = 4669. Correct or wrong? (a) wrong (b) correct

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