Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 704 · 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: 46 × 25 = 1148. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 52 × 81 = 4218. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 608 + 536 = 1144. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 533 + 350 = 891. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 57 × 30 = 1710. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 75 × 33 = 2475. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 411 + 204 = 622. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 723 + 740 = 1469. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 395 + 822 = 1215. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 671 + 616 = 1294. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 37 × 54 = 1998. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 666 + 238 = 904. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 60 × 66 = 3955. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 88 × 82 = 7216. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 460 + 194 = 654. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 218 + 489 = 705. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 28 × 21 = 588. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 25 × 35 = 875. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 60 × 32 = 1920. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 594 + 508 = 1103. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 16 × 67 = 1066. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 133 + 402 = 535. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 57 × 81 = 4617. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 18 × 91 = 1638. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 49 × 18 = 882. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 81 × 95 = 7697. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 505 + 141 = 638. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 24 × 44 = 1059. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 770 + 827 = 1593. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 78 × 48 = 3743. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 961 + 793 = 1754. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 64 × 24 = 1543. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 120 + 595 = 715. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 674 + 530 = 1204. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 882 + 270 = 1152. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 40 × 62 = 2488. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 459 + 237 = 696. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 42 × 45 = 1885. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 25 × 58 = 1448. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 35 × 49 = 1715. Correct or wrong? (a) correct (b) wrong

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