Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 609 · 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: 709 + 753 = 1464. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 15 × 50 = 750. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 766 + 333 = 1097. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 968 + 779 = 1746. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 46 × 44 = 2024. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 616 + 327 = 938. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 55 × 75 = 4125. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 23 × 78 = 1789. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 387 + 981 = 1368. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 409 + 250 = 659. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 26 × 17 = 450. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 64 × 82 = 5248. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 46 = 1329. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 278 + 151 = 430. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 614 + 805 = 1419. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 62 × 87 = 5394. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 946 + 464 = 1410. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 975 + 748 = 1725. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 69 × 19 = 1308. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 44 × 84 = 3696. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 513 + 410 = 923. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 163 + 479 = 639. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 833 + 345 = 1186. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 43 × 33 = 1413. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 20 × 25 = 500. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 849 + 950 = 1800. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 81 × 30 = 2430. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 25 × 30 = 750. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 712 + 129 = 841. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 51 × 73 = 3723. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 918 + 272 = 1190. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 483 + 716 = 1199. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 373 + 569 = 942. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 75 × 64 = 4800. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 922 + 474 = 1396. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 17 = 237. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 459 + 370 = 829. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 631 + 255 = 889. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 61 × 62 = 3782. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 313 + 356 = 676. Correct or wrong? (a) correct (b) wrong

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