Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 192 · 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: 42 × 53 = 2232. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 890 + 330 = 1220. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 489 + 762 = 1254. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 60 × 32 = 1920. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 18 × 34 = 612. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 975 + 685 = 1660. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 201 + 660 = 857. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 716 + 903 = 1619. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 94 × 28 = 2632. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 150 + 515 = 665. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 452 + 465 = 916. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 913 + 147 = 1065. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 236 + 364 = 604. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 158 + 965 = 1123. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 16 × 71 = 1136. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 445 + 597 = 1042. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 598 + 704 = 1302. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 501 + 820 = 1318. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 23 × 68 = 1564. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 58 × 20 = 1160. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 501 + 443 = 945. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 281 + 139 = 420. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 39 × 70 = 2738. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 82 × 49 = 4013. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 271 + 743 = 1013. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 464 + 498 = 964. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 87 × 72 = 6264. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 51 × 67 = 3409. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 621 + 201 = 826. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 897 + 891 = 1794. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 944 + 408 = 1356. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 874 + 853 = 1726. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 81 × 25 = 2025. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 93 × 90 = 8373. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 135 + 822 = 957. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 92 × 83 = 7636. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 167 + 625 = 798. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 35 × 62 = 2170. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 15 × 31 = 465. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 57 × 97 = 5530. Correct or wrong? (a) correct (b) wrong

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