Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 510 · 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: 402 + 339 = 739. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 99 × 20 = 1980. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 32 × 25 = 793. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 428 + 853 = 1281. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 67 × 23 = 1541. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 20 × 59 = 1180. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 161 + 188 = 349. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 483 + 753 = 1236. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 35 × 67 = 2345. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 900 + 758 = 1662. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 819 + 912 = 1739. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 296 + 210 = 506. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 335 + 741 = 1076. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 65 × 84 = 5460. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 15 × 39 = 592. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 277 + 736 = 1012. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 57 × 41 = 2335. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 55 × 39 = 2145. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 44 × 79 = 3476. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 60 × 95 = 5700. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 28 × 95 = 2660. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 37 × 19 = 703. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 607 + 995 = 1602. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 984 + 363 = 1350. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 45 × 75 = 3374. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 751 + 735 = 1486. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 87 × 23 = 2001. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 175 + 379 = 554. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 417 + 745 = 1154. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 647 + 895 = 1542. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 86 = 3526. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 93 × 29 = 2697. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 601 + 441 = 1038. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 481 + 329 = 804. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 832 + 769 = 1601. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 16 × 38 = 607. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 27 × 69 = 1862. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 514 + 630 = 1150. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 23 × 56 = 1287. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 610 + 343 = 955. Correct or wrong? (a) correct (b) wrong

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