Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 573 · 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: 605 + 528 = 1133. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 430 + 768 = 1196. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 91 × 70 = 6374. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 857 + 512 = 1372. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 902 + 499 = 1393. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 79 × 18 = 1416. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 91 × 77 = 7008. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 58 × 56 = 3248. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 929 + 939 = 1868. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 69 × 32 = 2208. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 64 × 70 = 4481. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 38 × 30 = 1140. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 72 × 99 = 7128. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 77 × 28 = 2156. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 68 × 19 = 1292. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 50 × 32 = 1600. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 88 × 32 = 2816. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 357 + 271 = 628. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 91 × 92 = 8372. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 71 × 38 = 2698. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 681 + 983 = 1666. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 17 × 39 = 660. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 123 + 141 = 271. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 25 × 25 = 625. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 20 × 96 = 1921. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 454 + 988 = 1442. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 76 × 97 = 7372. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 320 + 126 = 446. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 14 × 29 = 404. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 734 + 695 = 1428. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 26 × 12 = 317. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 53 × 13 = 686. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 91 × 38 = 3458. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 816 + 571 = 1387. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 51 × 20 = 1019. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 839 + 837 = 1676. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 56 × 32 = 1794. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 40 × 15 = 607. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 27 × 16 = 438. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 57 × 79 = 4502. Correct or wrong? (a) correct (b) wrong

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