Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 549 · 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: 51 × 93 = 4747. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 36 × 70 = 2520. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 697 + 307 = 1000. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 796 + 224 = 1022. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 53 × 15 = 795. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 988 + 206 = 1190. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 55 × 22 = 1214. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 382 + 916 = 1298. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 390 + 129 = 519. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 574 + 434 = 1008. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 22 × 26 = 572. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 709 + 971 = 1680. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 193 + 737 = 925. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 379 + 679 = 1058. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 33 × 92 = 3039. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 69 = 5936. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 92 × 72 = 6624. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 507 + 395 = 902. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 41 = 1183. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 31 × 57 = 1775. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 87 × 52 = 4524. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 240 + 533 = 773. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 896 + 840 = 1736. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 38 × 25 = 942. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 237 + 312 = 541. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 911 + 944 = 1863. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 336 + 882 = 1223. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 589 + 368 = 957. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 92 = 4232. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 13 × 23 = 299. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 78 × 32 = 2496. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 13 × 99 = 1287. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 24 × 95 = 2272. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 67 × 95 = 6365. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 479 + 858 = 1337. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 80 × 16 = 1280. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 928 + 362 = 1291. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 28 × 23 = 648. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 65 × 57 = 3697. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 89 × 30 = 2673. Correct or wrong? (a) wrong (b) correct

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