Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 528 · 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: 839 + 326 = 1164. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 90 × 49 = 4410. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 367 + 595 = 962. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 57 × 29 = 1658. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 76 × 82 = 6237. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 63 × 74 = 4661. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 95 × 21 = 2003. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 80 × 13 = 1040. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 54 × 72 = 3885. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 45 × 53 = 2385. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 31 × 86 = 2658. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 12 × 62 = 749. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 189 + 578 = 772. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 649 + 221 = 870. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 32 × 82 = 2624. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 67 = 1080. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 25 × 34 = 848. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 249 + 226 = 475. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 18 × 54 = 969. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 726 + 385 = 1111. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 82 = 5740. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 849 + 221 = 1070. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 23 × 67 = 1549. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 36 × 98 = 3528. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 26 × 93 = 2418. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 943 + 376 = 1319. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 35 = 489. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 599 + 577 = 1184. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 23 × 41 = 943. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 82 × 36 = 2952. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 69 × 96 = 6624. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 42 × 34 = 1428. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 181 + 694 = 875. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 30 × 95 = 2850. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 919 + 155 = 1080. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 53 × 30 = 1589. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 467 + 533 = 997. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 475 + 570 = 1045. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 34 × 36 = 1224. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 39 × 33 = 1287. Correct or wrong? (a) wrong (b) correct

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