Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 395 · 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: 457 + 583 = 1047. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 920 + 372 = 1299. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 955 + 644 = 1596. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 345 + 169 = 514. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 94 × 97 = 9118. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 345 + 776 = 1124. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 94 × 36 = 3384. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 453 + 403 = 850. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 246 + 417 = 663. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 45 × 52 = 2340. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 255 + 181 = 436. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 91 × 70 = 6370. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 59 × 42 = 2478. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 39 × 60 = 2338. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 370 + 274 = 644. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 51 × 28 = 1428. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 22 × 74 = 1628. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 14 × 77 = 1079. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 53 × 99 = 5247. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 29 × 37 = 1077. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 295 + 179 = 472. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 93 × 89 = 8277. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 806 + 768 = 1574. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 405 + 158 = 563. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 38 × 91 = 3458. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 44 × 19 = 836. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 945 + 610 = 1555. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 32 × 50 = 1596. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 177 + 512 = 689. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 185 + 266 = 446. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 194 + 476 = 670. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 273 + 908 = 1181. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 365 + 258 = 623. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 53 × 89 = 4710. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 635 + 947 = 1579. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 68 × 69 = 4692. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 83 × 16 = 1328. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 868 + 440 = 1308. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 18 × 19 = 336. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 726 + 591 = 1324. Correct or wrong? (a) wrong (b) correct

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