Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 532 · 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: 302 + 636 = 938. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 398 + 204 = 602. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 19 = 1607. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 56 × 96 = 5375. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 68 × 17 = 1151. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 18 × 50 = 900. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 49 × 31 = 1519. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 964 + 541 = 1505. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 30 × 13 = 398. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 293 + 660 = 953. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 80 × 23 = 1840. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 855 + 558 = 1415. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 174 + 423 = 602. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 79 × 19 = 1501. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 366 + 495 = 855. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 17 × 12 = 204. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 34 × 62 = 2108. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 33 × 61 = 2013. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 85 × 22 = 1874. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 495 + 999 = 1486. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 324 + 611 = 929. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 120 + 893 = 1013. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 54 × 53 = 2867. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 180 + 535 = 715. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 57 × 75 = 4283. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 14 × 45 = 630. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 35 × 85 = 2980. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 421 + 253 = 674. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 70 × 95 = 6650. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 139 + 273 = 417. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 196 + 452 = 652. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 46 × 27 = 1242. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 20 × 49 = 981. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 689 + 542 = 1230. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 71 × 77 = 5462. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 137 + 840 = 977. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 905 + 979 = 1877. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 606 + 723 = 1332. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 180 + 895 = 1080. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 904 + 728 = 1632. Correct or wrong? (a) correct (b) wrong

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