Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 774 · 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: 815 + 349 = 1164. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 768 + 658 = 1419. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 80 × 45 = 3593. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 287 + 558 = 843. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 319 + 745 = 1068. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 319 + 577 = 896. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 765 + 687 = 1452. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 22 × 20 = 446. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 716 + 567 = 1283. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 60 × 13 = 784. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 682 + 432 = 1114. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 677 + 583 = 1260. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 487 + 144 = 637. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 17 × 95 = 1617. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 16 × 42 = 668. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 96 × 72 = 6912. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 85 = 2890. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 14 × 61 = 854. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 43 × 84 = 3618. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 349 + 522 = 871. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 47 × 37 = 1740. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 550 + 629 = 1180. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 58 × 71 = 4118. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 665 + 268 = 933. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 462 + 222 = 690. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 713 + 894 = 1610. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 765 + 169 = 934. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 76 × 52 = 3951. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 500 + 758 = 1258. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 761 + 161 = 922. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 403 + 966 = 1369. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 198 + 488 = 684. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 12 × 87 = 1044. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 232 + 722 = 954. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 749 + 929 = 1685. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 23 × 41 = 943. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 12 × 37 = 444. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 18 × 72 = 1296. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 257 + 460 = 717. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 465 + 236 = 700. Correct or wrong? (a) correct (b) wrong

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