Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 351 · 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: 68 × 86 = 5855. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 934 + 943 = 1877. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 844 + 286 = 1125. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 626 + 646 = 1274. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 25 × 39 = 981. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 28 × 57 = 1601. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 302 + 275 = 575. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 44 = 755. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 58 × 31 = 1795. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 32 × 22 = 704. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 79 = 2688. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 249 + 391 = 648. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 20 × 28 = 560. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 47 × 16 = 752. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 24 × 67 = 1616. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 27 × 77 = 2083. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 93 × 26 = 2418. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 65 × 13 = 845. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 321 + 612 = 933. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 312 + 172 = 477. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 719 + 276 = 995. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 988 + 524 = 1512. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 88 × 56 = 4928. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 75 × 84 = 6300. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 250 + 424 = 674. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 51 × 46 = 2345. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 388 + 233 = 621. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 40 × 40 = 1600. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 900 + 329 = 1233. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 61 × 70 = 4276. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 370 + 461 = 831. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 354 + 889 = 1243. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 83 × 38 = 3154. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 886 + 510 = 1402. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 21 = 404. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 825 + 443 = 1274. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 248 + 241 = 489. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 350 + 238 = 588. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 699 + 213 = 912. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 721 + 243 = 964. Correct or wrong? (a) correct (b) wrong

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