Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 343 · 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: 28 × 76 = 2133. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 387 + 829 = 1223. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 23 × 26 = 598. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 224 + 408 = 630. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 800 + 986 = 1788. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 17 × 15 = 253. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 722 + 982 = 1706. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 324 + 829 = 1153. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 686 + 749 = 1435. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 643 + 174 = 818. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 22 × 31 = 682. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 244 + 146 = 390. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 687 + 531 = 1218. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 14 × 28 = 392. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 20 × 40 = 800. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 693 + 852 = 1545. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 38 × 80 = 3040. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 164 + 149 = 313. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 256 + 620 = 876. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 610 + 492 = 1099. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 993 + 469 = 1462. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 29 × 37 = 1073. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 39 × 23 = 897. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 437 + 779 = 1213. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 973 + 804 = 1777. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 661 + 755 = 1414. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 39 × 15 = 585. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 76 × 96 = 7296. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 782 + 358 = 1140. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 17 × 75 = 1282. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 16 × 34 = 544. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 370 + 519 = 894. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 47 × 54 = 2538. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 48 × 36 = 1733. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 489 + 530 = 1024. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 33 × 20 = 660. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 53 × 42 = 2220. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 34 × 46 = 1564. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 32 × 14 = 440. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 544 + 498 = 1037. Correct or wrong? (a) wrong (b) correct

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