Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 804 · 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: 680 + 175 = 855. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 58 × 38 = 2204. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 39 × 77 = 3003. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 773 + 700 = 1467. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 701 + 752 = 1453. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 317 + 869 = 1182. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 93 × 37 = 3441. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 42 × 61 = 2561. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 818 + 129 = 945. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 16 × 29 = 466. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 210 + 593 = 803. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 81 × 28 = 2268. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 202 + 659 = 865. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 853 + 454 = 1299. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 534 + 843 = 1374. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 257 + 852 = 1102. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 35 × 39 = 1365. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 216 + 300 = 516. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 28 × 47 = 1316. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 79 × 87 = 6873. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 929 + 272 = 1197. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 371 + 910 = 1286. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 375 + 624 = 1004. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 26 × 55 = 1435. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 51 × 88 = 4488. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 306 + 252 = 558. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 61 × 75 = 4575. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 747 + 976 = 1726. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 989 + 677 = 1674. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 31 × 83 = 2573. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 469 + 904 = 1373. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 14 × 14 = 196. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 580 + 402 = 982. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 576 + 449 = 1025. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 35 × 43 = 1505. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 528 + 421 = 943. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 22 × 94 = 2068. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 543 + 497 = 1040. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 284 + 630 = 914. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 390 + 156 = 544. Correct or wrong? (a) correct (b) wrong

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