Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 469 · 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: 70 × 17 = 1190. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 275 + 693 = 968. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 231 + 208 = 435. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 86 × 16 = 1374. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 14 × 76 = 1067. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 598 + 992 = 1590. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 26 × 54 = 1404. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 968 + 801 = 1769. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 47 × 55 = 2593. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 871 + 892 = 1763. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 32 × 46 = 1474. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 44 × 21 = 924. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 180 + 444 = 624. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 854 + 975 = 1835. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 75 × 13 = 975. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 93 × 66 = 6130. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 86 × 21 = 1806. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 39 × 31 = 1208. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 96 × 51 = 4896. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 32 × 74 = 2365. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 14 × 55 = 770. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 64 × 50 = 3200. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 734 + 678 = 1412. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 121 + 170 = 283. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 65 × 26 = 1690. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 507 + 803 = 1305. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 67 × 43 = 2885. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 240 + 302 = 540. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 449 + 616 = 1065. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 309 + 939 = 1254. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 82 × 22 = 1809. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 122 + 417 = 539. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 293 + 715 = 1012. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 78 × 35 = 2730. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 466 + 353 = 819. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 757 + 350 = 1100. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 63 × 49 = 3087. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 182 + 161 = 343. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 886 + 810 = 1696. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 26 × 42 = 1099. Correct or wrong? (a) correct (b) wrong

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