Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 968 · 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: 943 + 669 = 1619. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 882 + 964 = 1846. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 80 × 38 = 3040. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 950 + 691 = 1641. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 47 × 24 = 1128. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 589 + 495 = 1086. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 77 × 14 = 1078. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 86 × 73 = 6282. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 925 + 537 = 1462. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 54 × 48 = 2592. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 78 × 56 = 4364. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 34 × 49 = 1666. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 196 + 568 = 765. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 734 + 606 = 1340. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 908 + 295 = 1203. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 20 × 57 = 1145. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 548 + 757 = 1307. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 74 × 22 = 1627. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 437 + 647 = 1084. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 46 × 82 = 3772. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 98 × 49 = 4802. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 82 × 29 = 2378. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 72 × 68 = 4896. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 81 × 87 = 7050. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 753 + 854 = 1608. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 52 × 25 = 1300. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 433 + 624 = 1050. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 319 + 800 = 1119. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 33 × 84 = 2767. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 760 + 476 = 1236. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 22 × 65 = 1430. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 885 + 909 = 1794. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 579 + 781 = 1360. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 860 + 342 = 1206. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 81 × 83 = 6731. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 73 × 73 = 5328. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 177 + 254 = 431. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 412 + 886 = 1296. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 265 + 894 = 1159. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 28 × 13 = 368. Correct or wrong? (a) wrong (b) correct

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