Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 108 · 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: 859 + 418 = 1281. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 60 × 86 = 5160. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 76 × 32 = 2431. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 317 + 940 = 1257. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 78 × 65 = 5070. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 62 × 86 = 5334. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 29 × 54 = 1566. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 821 + 362 = 1183. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 450 + 523 = 970. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 46 × 79 = 3634. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 236 + 867 = 1110. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 333 + 730 = 1060. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 683 + 346 = 1029. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 664 + 359 = 1020. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 79 × 21 = 1659. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 473 + 554 = 1029. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 460 + 732 = 1187. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 164 + 320 = 480. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 806 + 710 = 1516. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 41 × 76 = 3116. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 57 × 70 = 3995. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 324 + 286 = 616. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 98 × 89 = 8722. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 873 + 361 = 1236. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 352 + 990 = 1342. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 31 × 88 = 2728. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 445 + 839 = 1284. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 75 × 70 = 5257. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 43 × 88 = 3787. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 98 × 70 = 6860. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 91 × 81 = 7371. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 33 × 29 = 957. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 507 + 677 = 1181. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 42 × 67 = 2812. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 71 × 14 = 987. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 15 × 70 = 1058. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 638 + 367 = 1005. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 35 × 54 = 1898. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 404 + 515 = 918. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 226 + 736 = 962. Correct or wrong? (a) correct (b) wrong

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