Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 307 · 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: 135 + 502 = 638. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 222 + 558 = 780. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 43 × 14 = 606. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 189 + 817 = 1011. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 965 + 422 = 1387. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 23 × 52 = 1196. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 867 + 496 = 1363. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 46 × 75 = 3443. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 21 × 68 = 1428. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 333 + 231 = 572. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 903 + 420 = 1327. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 233 + 996 = 1229. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 679 + 342 = 1017. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 413 + 228 = 634. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 68 × 29 = 1976. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 72 × 27 = 1951. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 39 × 46 = 1794. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 920 + 577 = 1501. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 409 + 781 = 1190. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 38 × 33 = 1251. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 30 × 28 = 846. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 52 × 15 = 785. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 12 × 67 = 804. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 97 × 37 = 3589. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 63 × 82 = 5166. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 75 × 36 = 2700. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 345 + 264 = 612. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 48 × 65 = 3120. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 268 + 141 = 405. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 63 × 60 = 3776. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 541 + 983 = 1532. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 897 + 471 = 1374. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 136 + 899 = 1035. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 64 × 21 = 1336. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 93 × 35 = 3261. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 542 + 375 = 922. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 852 + 212 = 1069. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 67 × 22 = 1471. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 80 × 59 = 4720. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 776 + 568 = 1350. Correct or wrong? (a) wrong (b) correct

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