Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 853 · 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: 759 + 944 = 1696. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 388 + 678 = 1066. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 29 × 26 = 754. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 479 + 308 = 789. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 221 + 719 = 940. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 41 × 41 = 1681. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 86 × 65 = 5590. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 151 + 174 = 317. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 221 + 797 = 1024. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 40 × 58 = 2327. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 94 × 64 = 6010. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 91 × 79 = 7183. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 584 + 855 = 1439. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 949 + 244 = 1193. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 53 × 42 = 2226. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 826 + 481 = 1300. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 652 + 867 = 1519. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 69 × 71 = 4899. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 248 + 960 = 1211. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 36 × 18 = 648. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 26 × 33 = 852. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 66 = 1518. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 919 + 348 = 1267. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 26 × 48 = 1252. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 346 + 526 = 872. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 175 + 475 = 650. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 772 + 853 = 1632. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 365 + 303 = 670. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 380 + 667 = 1054. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 201 + 536 = 735. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 751 + 508 = 1252. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 68 × 21 = 1428. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 142 + 599 = 741. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 453 + 328 = 776. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 244 + 804 = 1051. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 22 × 82 = 1798. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 200 + 843 = 1043. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 551 + 260 = 811. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 69 × 98 = 6765. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 755 + 793 = 1548. Correct or wrong? (a) correct (b) wrong

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