Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 959 · 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: 391 + 748 = 1145. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 269 + 955 = 1224. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 960 + 448 = 1408. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 29 × 44 = 1280. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 504 + 788 = 1294. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 82 × 23 = 1886. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 92 × 29 = 2668. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 73 × 27 = 1971. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 336 + 851 = 1194. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 678 + 261 = 939. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 36 × 57 = 2058. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 158 + 576 = 734. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 41 × 37 = 1517. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 93 × 50 = 4650. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 34 = 1597. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 91 × 27 = 2462. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 38 × 84 = 3192. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 722 + 199 = 921. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 32 × 77 = 2459. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 20 × 61 = 1220. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 608 + 723 = 1331. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 360 + 856 = 1216. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 335 + 883 = 1218. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 34 × 89 = 3025. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 71 × 98 = 6958. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 56 × 65 = 3632. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 131 + 625 = 754. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 70 × 55 = 3858. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 159 + 162 = 319. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 633 + 902 = 1533. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 998 + 467 = 1467. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 96 × 15 = 1440. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 64 × 17 = 1088. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 66 × 28 = 1848. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 352 + 187 = 539. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 26 × 24 = 631. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 723 + 198 = 921. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 287 + 919 = 1206. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 20 × 60 = 1201. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 979 + 298 = 1282. Correct or wrong? (a) correct (b) wrong

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