Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 20 · 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: 76 × 30 = 2272. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 94 × 66 = 6204. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 80 × 37 = 2960. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 39 × 32 = 1248. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 415 + 314 = 729. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 395 + 334 = 729. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 97 × 71 = 6887. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 705 + 362 = 1069. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 69 × 12 = 828. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 948 + 739 = 1687. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 51 × 80 = 4080. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 73 × 17 = 1241. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 97 × 84 = 8152. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 82 × 34 = 2788. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 25 × 39 = 975. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 388 + 176 = 569. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 71 × 69 = 4897. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 66 × 21 = 1385. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 896 + 683 = 1579. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 752 + 729 = 1481. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 87 × 19 = 1653. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 694 + 321 = 1014. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 27 × 16 = 428. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 812 + 855 = 1667. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 74 × 24 = 1776. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 45 × 35 = 1583. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 781 + 130 = 916. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 536 + 971 = 1504. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 58 × 18 = 1044. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 61 × 63 = 3842. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 25 × 80 = 2000. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 35 × 84 = 2940. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 730 + 323 = 1053. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 86 × 54 = 4644. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 135 + 384 = 519. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 71 × 76 = 5392. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 718 + 580 = 1298. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 96 × 89 = 8546. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 21 × 15 = 313. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 68 × 93 = 6318. Correct or wrong? (a) correct (b) wrong

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