Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 586 · 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: 19 × 50 = 950. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 64 × 25 = 1600. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 65 × 81 = 5271. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 69 × 87 = 5997. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 45 × 96 = 4312. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 591 + 374 = 965. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 894 + 526 = 1423. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 75 = 2475. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 38 × 20 = 767. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 367 + 166 = 536. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 70 × 55 = 3850. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 48 × 28 = 1339. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 221 + 212 = 438. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 14 × 28 = 392. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 224 + 403 = 624. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 13 × 46 = 598. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 886 + 284 = 1172. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 26 × 45 = 1172. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 15 × 87 = 1305. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 83 × 49 = 4067. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 82 × 84 = 6892. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 24 × 83 = 1992. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 526 + 324 = 853. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 519 + 813 = 1332. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 502 + 434 = 936. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 18 × 35 = 622. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 381 + 383 = 766. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 328 + 879 = 1207. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 395 + 901 = 1296. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 87 × 76 = 6612. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 474 + 727 = 1206. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 90 × 46 = 4136. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 29 × 84 = 2435. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 92 = 7728. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 80 × 49 = 3923. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 999 + 298 = 1296. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 495 + 672 = 1167. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 17 × 43 = 731. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 20 × 19 = 380. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 143 + 217 = 360. Correct or wrong? (a) correct (b) wrong

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