Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 907 · 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: 693 + 831 = 1524. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 70 × 25 = 1754. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 70 = 1120. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 350 + 408 = 758. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 225 + 353 = 583. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 52 × 47 = 2451. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 586 + 140 = 733. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 44 × 90 = 3963. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 60 × 17 = 1022. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 626 + 209 = 836. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 908 + 597 = 1505. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 58 × 51 = 2958. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 966 + 200 = 1166. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 47 × 13 = 611. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 638 + 490 = 1135. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 95 × 17 = 1615. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 87 × 55 = 4785. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 84 × 73 = 6139. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 25 × 28 = 699. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 81 × 26 = 2102. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 47 × 89 = 4185. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 33 = 1346. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 45 × 86 = 3870. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 848 + 526 = 1374. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 49 × 16 = 784. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 454 + 322 = 776. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 67 × 25 = 1675. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 24 × 49 = 1175. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 935 + 380 = 1314. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 73 × 28 = 2044. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 265 + 140 = 408. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 37 × 64 = 2368. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 176 + 433 = 609. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 251 + 852 = 1103. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 29 × 83 = 2407. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 39 × 93 = 3633. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 87 × 55 = 4790. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 673 + 755 = 1428. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 96 × 49 = 4704. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 180 + 869 = 1049. Correct or wrong? (a) correct (b) wrong

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