Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 605 · 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: 28 × 13 = 364. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 80 × 97 = 7768. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 85 × 48 = 4085. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 29 × 12 = 348. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 345 + 144 = 489. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 40 × 66 = 2643. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 60 × 26 = 1560. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 778 + 673 = 1451. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 698 + 580 = 1285. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 99 × 76 = 7520. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 55 × 27 = 1477. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 517 + 280 = 804. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 98 × 29 = 2842. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 24 × 24 = 578. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 64 × 59 = 3776. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 57 × 41 = 2337. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 953 + 161 = 1108. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 78 × 17 = 1326. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 975 + 126 = 1101. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 640 + 794 = 1439. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 99 × 91 = 9009. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 13 × 99 = 1287. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 67 × 69 = 4631. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 21 × 47 = 994. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 928 + 234 = 1162. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 32 × 61 = 1952. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 42 × 19 = 790. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 34 × 13 = 442. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 28 × 73 = 2044. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 916 + 580 = 1501. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 853 + 346 = 1202. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 41 × 70 = 2873. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 214 + 594 = 807. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 293 + 592 = 887. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 95 × 72 = 6840. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 29 × 89 = 2588. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 79 × 38 = 2998. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 226 + 690 = 908. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 78 × 86 = 6703. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 257 + 597 = 846. Correct or wrong? (a) correct (b) wrong

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