Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 65 · 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: 667 + 792 = 1452. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 360 + 917 = 1272. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 31 × 16 = 503. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 960 + 544 = 1504. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 618 + 953 = 1570. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 862 + 307 = 1166. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 316 + 598 = 911. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 360 + 154 = 508. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 91 × 17 = 1551. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 941 + 557 = 1498. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 98 × 77 = 7546. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 719 + 305 = 1024. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 448 + 457 = 899. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 31 × 77 = 2387. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 57 = 3021. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 31 × 20 = 620. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 852 + 561 = 1409. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 931 + 284 = 1215. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 19 × 47 = 893. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 77 × 80 = 6165. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 34 × 33 = 1122. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 96 × 39 = 3744. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 807 + 158 = 966. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 90 × 18 = 1625. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 15 × 24 = 360. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 874 + 439 = 1313. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 29 × 34 = 986. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 21 = 756. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 82 × 89 = 7298. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 81 × 59 = 4779. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 29 × 87 = 2522. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 46 × 14 = 644. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 396 + 399 = 795. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 782 + 481 = 1263. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 594 + 217 = 808. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 374 + 224 = 590. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 97 × 88 = 8540. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 348 + 424 = 772. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 15 × 29 = 434. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 731 + 844 = 1573. Correct or wrong? (a) correct (b) wrong

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