Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 868 · 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: 49 × 82 = 4017. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 79 × 99 = 7827. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 515 + 178 = 693. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 38 × 99 = 3762. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 635 + 359 = 994. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 910 + 258 = 1168. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 473 + 899 = 1372. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 809 + 166 = 978. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 80 × 33 = 2641. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 15 × 14 = 210. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 82 × 87 = 7128. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 38 × 36 = 1368. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 758 + 642 = 1395. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 701 + 238 = 947. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 708 + 799 = 1507. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 707 + 288 = 989. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 617 + 334 = 959. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 154 + 133 = 286. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 56 × 24 = 1337. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 98 × 57 = 5586. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 97 × 23 = 2233. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 412 + 494 = 906. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 685 + 441 = 1131. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 895 + 363 = 1264. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 211 + 294 = 505. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 68 × 74 = 5032. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 139 + 936 = 1075. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 495 + 594 = 1096. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 25 × 17 = 421. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 82 × 28 = 2293. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 37 × 97 = 3583. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 91 × 69 = 6282. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 90 × 71 = 6390. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 276 + 297 = 573. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 35 × 26 = 910. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 38 × 88 = 3336. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 743 + 266 = 1009. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 52 × 51 = 2651. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 34 × 17 = 578. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 884 + 463 = 1345. Correct or wrong? (a) wrong (b) correct

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