Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 645 · 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: 894 + 469 = 1368. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 38 × 43 = 1635. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 99 × 19 = 1881. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 637 + 964 = 1601. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 36 × 31 = 1116. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 86 × 29 = 2494. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 72 × 95 = 6840. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 833 + 426 = 1259. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 39 = 585. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 81 × 62 = 5022. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 600 + 702 = 1302. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 589 + 260 = 849. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 563 + 129 = 692. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 795 + 778 = 1571. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 94 × 26 = 2449. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 96 × 52 = 4996. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 90 × 98 = 8820. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 28 × 52 = 1456. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 201 + 136 = 340. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 711 + 526 = 1239. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 28 × 99 = 2775. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 818 + 872 = 1694. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 23 = 337. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 14 × 55 = 776. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 934 + 321 = 1255. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 75 × 81 = 6072. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 249 + 222 = 471. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 40 × 79 = 3167. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 234 + 817 = 1051. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 998 + 320 = 1318. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 41 × 93 = 3813. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 37 × 73 = 2701. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 182 + 244 = 422. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 54 × 52 = 2808. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 61 × 83 = 5063. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 78 × 65 = 5064. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 54 × 14 = 760. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 16 × 77 = 1232. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 139 + 540 = 679. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 89 × 20 = 1780. Correct or wrong? (a) wrong (b) correct

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