Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 462 · 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: 69 × 45 = 3105. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 957 + 531 = 1488. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 59 × 90 = 5312. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 22 × 59 = 1298. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 187 + 790 = 977. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 573 + 934 = 1507. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 64 × 89 = 5696. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 70 × 27 = 1890. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 463 + 324 = 787. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 92 × 97 = 8924. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 958 + 225 = 1178. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 81 × 46 = 3732. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 50 × 68 = 3400. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 72 × 75 = 5400. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 12 × 18 = 220. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 365 + 184 = 542. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 416 + 616 = 1040. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 29 × 99 = 2871. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 519 + 426 = 940. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 194 + 291 = 485. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 89 × 61 = 5422. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 45 × 78 = 3510. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 530 + 987 = 1520. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 368 + 353 = 721. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 87 × 75 = 6520. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 39 = 1053. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 765 + 689 = 1462. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 142 + 630 = 772. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 972 + 543 = 1508. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 221 + 167 = 396. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 71 × 55 = 3908. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 60 × 77 = 4617. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 980 + 654 = 1634. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 621 + 369 = 990. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 896 + 558 = 1454. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 500 + 468 = 968. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 253 + 435 = 682. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 224 + 479 = 703. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 610 + 735 = 1342. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 288 + 446 = 734. Correct or wrong? (a) wrong (b) correct

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