Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 837 · 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: 139 + 928 = 1067. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 355 + 315 = 667. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 979 + 322 = 1301. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 77 × 23 = 1771. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 50 × 63 = 3150. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 956 + 779 = 1735. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 617 + 289 = 899. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 141 + 964 = 1105. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 406 + 311 = 724. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 35 × 14 = 490. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 813 + 371 = 1184. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 63 × 36 = 2260. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 899 + 672 = 1571. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 51 × 32 = 1629. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 757 + 345 = 1102. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 65 × 78 = 5063. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 538 + 955 = 1493. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 33 × 36 = 1187. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 27 × 94 = 2533. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 255 + 890 = 1145. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 25 × 68 = 1705. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 572 + 910 = 1482. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 34 × 81 = 2754. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 792 + 230 = 1022. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 731 + 431 = 1162. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 880 + 266 = 1146. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 34 = 2950. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 88 × 65 = 5720. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 60 × 71 = 4263. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 753 + 780 = 1533. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 98 × 55 = 5390. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 63 × 72 = 4536. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 182 + 941 = 1119. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 16 × 98 = 1568. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 41 × 90 = 3692. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 538 + 380 = 918. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 312 + 817 = 1129. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 25 × 53 = 1325. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 97 × 34 = 3301. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 74 × 60 = 4435. Correct or wrong? (a) wrong (b) correct

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