Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 748 · 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: 948 + 886 = 1834. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 653 + 474 = 1125. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 619 + 495 = 1114. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 736 + 905 = 1642. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 12 × 96 = 1152. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 752 + 629 = 1381. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 146 + 925 = 1070. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 166 + 720 = 886. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 617 + 267 = 884. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 38 × 77 = 2926. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 61 × 44 = 2684. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 233 + 840 = 1073. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 238 + 503 = 739. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 445 + 327 = 772. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 972 + 406 = 1378. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 713 + 657 = 1373. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 273 + 433 = 713. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 719 + 291 = 1010. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 631 + 243 = 872. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 96 × 41 = 3936. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 146 + 393 = 540. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 171 + 245 = 416. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 127 + 898 = 1025. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 93 × 44 = 4100. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 571 + 260 = 824. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 21 × 32 = 668. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 465 + 787 = 1252. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 570 + 723 = 1293. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 61 × 15 = 915. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 96 × 23 = 2208. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 674 + 764 = 1443. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 332 + 893 = 1222. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 904 + 376 = 1280. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 147 + 914 = 1061. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 99 × 39 = 3861. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 361 + 178 = 531. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 83 × 46 = 3818. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 18 × 93 = 1674. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 824 + 677 = 1501. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 722 + 844 = 1561. Correct or wrong? (a) correct (b) wrong

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