Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 161 · 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: 17 × 71 = 1210. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 50 × 70 = 3504. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 916 + 469 = 1383. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 72 × 81 = 5835. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 21 × 44 = 924. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 90 × 14 = 1264. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 84 × 36 = 3029. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 885 + 418 = 1302. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 28 × 23 = 642. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 196 + 810 = 1006. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 311 + 456 = 759. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 957 + 897 = 1854. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 61 × 18 = 1098. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 257 + 333 = 592. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 218 + 183 = 401. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 22 × 23 = 506. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 640 + 203 = 843. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 70 × 60 = 4206. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 433 + 910 = 1336. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 171 + 268 = 439. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 22 × 74 = 1628. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 45 × 91 = 4092. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 16 × 41 = 656. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 544 + 886 = 1430. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 650 + 501 = 1154. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 68 × 90 = 6120. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 85 × 31 = 2630. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 763 + 682 = 1445. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 824 + 162 = 986. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 439 + 708 = 1144. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 58 × 49 = 2837. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 42 × 72 = 3020. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 814 + 657 = 1471. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 66 × 14 = 918. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 35 × 41 = 1435. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 358 + 469 = 827. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 394 + 299 = 693. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 18 × 45 = 810. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 38 × 18 = 682. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 73 × 58 = 4239. Correct or wrong? (a) wrong (b) correct

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