Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 272 · 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: 44 × 74 = 3250. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 565 + 443 = 1000. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 30 × 50 = 1500. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 685 + 426 = 1111. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 946 + 674 = 1619. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 354 + 795 = 1149. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 80 × 76 = 6087. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 664 + 283 = 946. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 24 × 41 = 984. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 38 × 26 = 988. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 14 × 52 = 725. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 50 × 62 = 3095. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 20 × 76 = 1522. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 166 + 389 = 555. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 96 × 19 = 1824. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 90 × 54 = 4858. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 40 × 61 = 2440. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 80 × 96 = 7688. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 34 × 55 = 1876. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 375 + 778 = 1148. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 98 × 86 = 8429. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 91 × 81 = 7371. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 55 × 78 = 4288. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 60 × 52 = 3120. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 60 × 34 = 2040. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 90 × 62 = 5580. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 859 + 274 = 1133. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 326 + 915 = 1247. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 65 × 13 = 845. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 811 + 867 = 1678. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 306 + 161 = 467. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 45 × 20 = 892. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 751 + 567 = 1318. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 14 × 38 = 533. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 95 × 79 = 7505. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 857 + 550 = 1407. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 570 + 965 = 1535. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 39 × 24 = 938. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 897 + 501 = 1398. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 648 + 672 = 1315. Correct or wrong? (a) correct (b) wrong

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