Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 739 · 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: 266 + 605 = 873. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 62 = 929. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 80 × 62 = 4960. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 56 × 48 = 2688. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 136 + 357 = 497. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 207 + 343 = 551. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 742 + 362 = 1104. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 59 × 76 = 4484. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 362 + 293 = 655. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 214 + 286 = 500. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 57 × 67 = 3818. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 302 + 648 = 950. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 19 × 27 = 513. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 84 × 53 = 4445. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 77 × 19 = 1463. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 95 × 68 = 6464. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 375 + 865 = 1244. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 88 × 22 = 1940. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 548 + 657 = 1205. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 406 + 999 = 1405. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 12 × 62 = 742. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 85 × 81 = 6885. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 814 + 508 = 1329. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 17 × 35 = 595. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 224 + 275 = 495. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 385 + 847 = 1232. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 77 = 1848. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 95 × 55 = 5228. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 37 × 65 = 2405. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 21 × 83 = 1737. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 53 × 86 = 4551. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 70 × 91 = 6370. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 493 + 598 = 1087. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 12 × 92 = 1104. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 24 × 25 = 600. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 436 + 591 = 1027. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 466 + 262 = 728. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 53 × 88 = 4663. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 28 × 96 = 2688. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 207 + 374 = 583. Correct or wrong? (a) wrong (b) correct

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