Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 440 · 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: 227 + 839 = 1060. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 613 + 758 = 1367. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 58 × 75 = 4350. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 156 + 439 = 595. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 773 + 270 = 1043. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 30 × 95 = 2850. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 312 + 621 = 935. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 30 × 84 = 2523. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 58 × 45 = 2614. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 37 × 29 = 1073. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 673 + 717 = 1390. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 32 × 75 = 2407. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 990 + 788 = 1778. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 41 × 66 = 2706. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 29 × 51 = 1479. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 244 + 457 = 708. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 311 + 490 = 806. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 442 + 363 = 805. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 870 + 358 = 1228. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 904 + 751 = 1662. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 85 × 42 = 3571. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 31 × 14 = 429. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 86 × 71 = 6107. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 901 + 174 = 1078. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 78 × 44 = 3432. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 81 × 75 = 6075. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 52 × 30 = 1563. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 62 × 79 = 4905. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 94 × 14 = 1316. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 83 × 43 = 3576. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 42 × 69 = 2898. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 146 + 287 = 433. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 77 × 37 = 2846. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 93 × 29 = 2704. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 612 + 629 = 1239. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 423 + 919 = 1342. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 221 + 353 = 571. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 435 + 526 = 953. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 44 × 84 = 3696. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 37 × 52 = 1924. Correct or wrong? (a) correct (b) wrong

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