Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 967 · 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: 829 + 491 = 1313. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 32 × 17 = 542. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 13 × 23 = 299. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 191 + 209 = 399. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 849 + 772 = 1621. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 55 × 16 = 883. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 15 × 59 = 885. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 87 × 96 = 8360. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 34 × 51 = 1734. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 59 × 15 = 885. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 506 + 811 = 1323. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 723 + 380 = 1105. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 47 × 72 = 3384. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 17 × 46 = 786. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 95 = 4465. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 93 × 33 = 3069. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 71 × 68 = 4831. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 398 + 745 = 1143. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 978 + 328 = 1306. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 80 × 29 = 2321. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 270 + 801 = 1071. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 17 × 17 = 289. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 69 × 44 = 3036. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 20 × 24 = 480. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 53 × 42 = 2226. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 368 + 884 = 1259. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 249 + 396 = 650. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 70 × 30 = 2096. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 30 × 41 = 1230. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 21 × 86 = 1807. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 73 × 17 = 1241. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 367 + 512 = 879. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 37 × 77 = 2849. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 42 × 28 = 1176. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 45 × 35 = 1575. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 31 × 67 = 2077. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 13 × 53 = 689. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 71 × 92 = 6528. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 61 × 30 = 1834. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 396 + 250 = 653. Correct or wrong? (a) correct (b) wrong

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