Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 807 · 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: 40 × 73 = 2920. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 58 × 80 = 4637. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 522 + 823 = 1348. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 981 + 130 = 1111. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 789 + 368 = 1153. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 89 × 44 = 3910. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 954 + 247 = 1206. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 456 + 870 = 1326. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 817 + 401 = 1220. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 508 + 364 = 868. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 60 × 78 = 4680. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 506 + 392 = 905. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 796 + 421 = 1217. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 410 + 838 = 1248. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 65 × 46 = 2994. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 814 + 962 = 1782. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 47 × 96 = 4506. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 272 + 308 = 579. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 31 × 44 = 1362. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 19 × 38 = 721. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 69 × 62 = 4280. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 332 + 562 = 894. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 380 + 271 = 644. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 51 × 76 = 3876. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 362 + 412 = 778. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 481 + 997 = 1478. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 20 × 74 = 1478. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 37 × 85 = 3143. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 35 × 17 = 598. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 136 + 912 = 1041. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 163 + 337 = 499. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 93 × 85 = 7905. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 989 + 693 = 1682. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 630 + 824 = 1454. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 50 × 15 = 750. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 754 + 799 = 1553. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 800 + 192 = 986. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 50 × 54 = 2700. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 34 × 45 = 1538. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 42 × 27 = 1130. Correct or wrong? (a) wrong (b) correct

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