Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 961 · 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: 651 + 174 = 829. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 52 × 64 = 3322. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 40 × 75 = 2992. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 685 + 722 = 1410. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 29 × 40 = 1163. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 139 + 606 = 748. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 579 + 605 = 1184. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 55 × 66 = 3622. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 848 + 997 = 1845. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 45 × 69 = 3099. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 70 × 78 = 5460. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 13 × 53 = 689. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 307 + 271 = 578. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 322 + 957 = 1279. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 684 + 819 = 1503. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 94 × 77 = 7245. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 72 × 65 = 4680. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 631 + 612 = 1246. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 27 × 15 = 410. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 40 × 70 = 2801. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 99 × 42 = 4158. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 13 × 40 = 519. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 37 = 2339. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 359 + 279 = 638. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 334 + 304 = 642. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 85 × 94 = 7990. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 165 + 986 = 1151. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 643 + 649 = 1292. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 57 × 34 = 1938. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 881 + 320 = 1204. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 65 × 73 = 4745. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 441 + 974 = 1415. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 502 + 428 = 930. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 772 + 220 = 987. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 564 + 350 = 920. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 483 + 302 = 781. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 43 = 1762. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 84 × 17 = 1425. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 99 × 84 = 8322. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 39 × 86 = 3352. Correct or wrong? (a) correct (b) wrong

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