Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 766 · 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: 248 + 422 = 665. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 54 × 89 = 4806. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 59 = 1829. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 526 + 778 = 1304. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 182 + 260 = 436. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 746 + 840 = 1584. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 464 + 625 = 1089. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 48 × 45 = 2160. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 68 × 97 = 6596. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 477 + 425 = 902. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 475 + 361 = 836. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 79 × 23 = 1817. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 139 + 558 = 700. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 59 × 91 = 5369. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 167 + 727 = 894. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 364 + 525 = 889. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 14 × 23 = 325. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 259 + 367 = 626. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 94 × 71 = 6676. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 81 × 46 = 3730. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 947 + 186 = 1129. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 734 + 135 = 869. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 965 + 869 = 1834. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 73 × 37 = 2694. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 604 + 343 = 942. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 26 × 26 = 676. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 620 + 833 = 1454. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 36 × 64 = 2304. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 33 × 26 = 858. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 14 × 68 = 959. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 18 × 36 = 648. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 346 + 788 = 1130. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 235 + 645 = 880. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 91 × 42 = 3822. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 499 + 689 = 1182. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 132 + 950 = 1088. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 94 × 87 = 8178. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 721 + 846 = 1567. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 82 × 99 = 8113. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 230 + 749 = 979. Correct or wrong? (a) correct (b) wrong

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