Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 329 · 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: 130 + 447 = 577. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 822 + 394 = 1216. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 15 × 28 = 420. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 727 + 717 = 1444. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 327 + 979 = 1306. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 932 + 218 = 1150. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 671 + 445 = 1116. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 82 × 52 = 4263. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 737 + 487 = 1224. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 502 + 962 = 1464. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 986 + 408 = 1395. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 27 × 18 = 486. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 58 × 26 = 1506. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 537 + 375 = 912. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 134 + 628 = 762. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 69 × 33 = 2273. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 13 × 28 = 364. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 758 + 606 = 1364. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 24 × 78 = 1872. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 282 + 836 = 1120. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 14 × 19 = 271. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 82 = 1804. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 20 × 97 = 1940. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 199 + 501 = 701. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 89 × 82 = 7298. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 93 × 68 = 6324. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 23 = 1587. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 99 × 67 = 6633. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 795 + 728 = 1525. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 141 + 694 = 835. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 23 × 85 = 1955. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 563 + 841 = 1404. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 50 × 23 = 1150. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 372 + 915 = 1289. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 944 + 379 = 1323. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 51 × 59 = 3012. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 84 × 24 = 2019. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 883 + 268 = 1152. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 77 × 66 = 5082. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 465 + 766 = 1236. Correct or wrong? (a) wrong (b) correct

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