Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 364 · 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: 82 × 92 = 7546. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 343 + 704 = 1045. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 250 + 758 = 1012. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 187 + 476 = 663. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 13 × 12 = 156. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 75 × 48 = 3594. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 489 + 683 = 1172. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 480 + 201 = 686. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 25 × 21 = 528. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 39 × 35 = 1365. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 69 × 20 = 1380. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 347 + 622 = 963. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 73 × 24 = 1752. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 233 + 869 = 1102. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 25 × 33 = 833. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 273 + 456 = 729. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 347 + 369 = 710. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 77 × 71 = 5469. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 56 × 15 = 847. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 23 × 34 = 782. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 90 × 89 = 8010. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 928 + 658 = 1586. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 31 × 59 = 1831. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 73 × 86 = 6278. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 31 × 63 = 1959. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 229 + 467 = 696. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 931 + 525 = 1452. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 70 × 19 = 1329. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 15 = 690. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 698 + 577 = 1283. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 436 + 456 = 892. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 813 + 402 = 1215. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 87 × 84 = 7308. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 472 + 210 = 688. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 88 × 12 = 1052. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 771 + 675 = 1444. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 58 × 15 = 870. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 46 × 71 = 3270. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 57 × 87 = 4953. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 16 × 41 = 656. Correct or wrong? (a) correct (b) wrong

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