Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 291 · 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: 925 + 337 = 1262. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 44 × 56 = 2464. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 30 × 19 = 570. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 337 + 940 = 1278. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 625 + 674 = 1300. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 69 × 69 = 4755. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 253 + 817 = 1070. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 40 = 1328. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 746 + 739 = 1485. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 66 × 82 = 5417. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 27 × 88 = 2378. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 17 × 80 = 1355. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 333 + 251 = 580. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 66 × 64 = 4224. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 44 × 83 = 3644. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 95 = 3135. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 47 × 59 = 2768. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 55 × 99 = 5445. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 966 + 726 = 1693. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 19 × 30 = 570. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 55 × 92 = 5060. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 752 + 635 = 1387. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 76 × 55 = 4177. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 700 + 700 = 1400. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 70 × 28 = 1961. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 661 + 596 = 1257. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 15 × 65 = 975. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 483 + 149 = 632. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 13 × 26 = 344. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 91 × 90 = 8190. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 49 × 25 = 1223. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 72 × 98 = 7063. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 418 + 828 = 1246. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 77 × 73 = 5625. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 39 × 17 = 655. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 363 + 841 = 1200. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 61 × 16 = 975. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 65 × 28 = 1820. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 77 × 36 = 2780. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 21 × 83 = 1743. Correct or wrong? (a) wrong (b) correct

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