Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 843 · 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: 71 × 75 = 5325. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 967 + 251 = 1218. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 38 × 87 = 3312. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 79 × 60 = 4740. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 319 + 920 = 1239. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 28 × 58 = 1627. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 31 × 44 = 1360. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 89 × 76 = 6764. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 99 × 77 = 7623. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 46 × 76 = 3496. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 343 + 684 = 1026. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 959 + 314 = 1279. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 24 × 98 = 2352. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 686 + 333 = 1019. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 26 × 43 = 1126. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 795 + 727 = 1522. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 46 × 88 = 4056. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 44 × 18 = 798. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 62 × 38 = 2356. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 82 × 96 = 7872. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 857 + 361 = 1220. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 73 × 19 = 1387. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 25 × 97 = 2422. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 71 × 93 = 6597. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 84 × 55 = 4618. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 27 × 57 = 1539. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 81 = 1944. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 821 + 543 = 1357. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 973 + 971 = 1944. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 63 × 52 = 3276. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 22 × 12 = 256. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 12 × 59 = 708. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 874 + 513 = 1387. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 224 + 885 = 1108. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 977 + 396 = 1378. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 176 + 530 = 706. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 56 × 39 = 2184. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 33 × 76 = 2508. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 819 + 859 = 1678. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 12 × 60 = 722. Correct or wrong? (a) wrong (b) correct

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