Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 682 · 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: 211 + 161 = 365. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 440 + 939 = 1379. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 66 × 23 = 1512. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 95 × 30 = 2850. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 448 + 316 = 764. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 391 + 188 = 576. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 864 + 773 = 1644. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 40 × 76 = 3047. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 37 × 82 = 3034. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 61 × 53 = 3233. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 710 + 898 = 1605. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 36 × 20 = 723. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 66 × 13 = 857. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 593 + 163 = 756. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 28 × 24 = 672. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 236 + 356 = 592. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 64 × 28 = 1794. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 281 + 666 = 947. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 54 = 3403. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 330 + 314 = 651. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 344 + 170 = 514. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 703 + 598 = 1301. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 18 × 70 = 1257. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 78 × 18 = 1399. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 18 × 70 = 1256. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 26 × 32 = 825. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 52 × 29 = 1508. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 970 + 467 = 1430. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 98 × 26 = 2548. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 43 × 92 = 3958. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 681 + 356 = 1042. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 526 + 967 = 1487. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 82 = 5746. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 253 + 441 = 691. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 93 × 56 = 5200. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 44 × 57 = 2508. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 23 × 87 = 2001. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 760 + 188 = 948. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 206 + 451 = 658. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 359 + 984 = 1343. Correct or wrong? (a) correct (b) wrong

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