Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 21 · 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: 87 × 81 = 7047. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 852 + 210 = 1059. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 946 + 377 = 1323. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 878 + 334 = 1212. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 389 + 885 = 1271. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 49 × 15 = 735. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 812 + 691 = 1496. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 513 + 193 = 708. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 649 + 522 = 1172. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 361 + 418 = 779. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 229 + 258 = 487. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 274 + 699 = 967. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 66 × 64 = 4224. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 406 + 725 = 1131. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 725 + 744 = 1469. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 42 × 99 = 4165. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 443 + 802 = 1245. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 510 + 370 = 879. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 56 × 94 = 5263. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 39 × 59 = 2300. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 903 + 215 = 1118. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 630 + 706 = 1336. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 17 × 75 = 1275. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 79 × 64 = 5056. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 70 × 80 = 5600. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 43 × 28 = 1204. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 641 + 643 = 1284. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 66 × 37 = 2448. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 34 × 49 = 1666. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 159 + 216 = 371. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 33 × 88 = 2904. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 83 × 69 = 5729. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 89 × 53 = 4717. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 267 + 660 = 922. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 909 + 970 = 1879. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 703 + 480 = 1183. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 47 × 97 = 4559. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 981 + 720 = 1707. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 32 × 36 = 1148. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 89 × 49 = 4354. Correct or wrong? (a) wrong (b) correct

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