Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 415 · 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: 746 + 382 = 1130. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 538 + 239 = 774. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 59 × 14 = 823. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 67 × 73 = 4891. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 412 + 220 = 632. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 27 × 15 = 405. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 454 + 131 = 585. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 35 × 86 = 3015. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 556 + 800 = 1356. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 37 × 51 = 1887. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 301 + 650 = 951. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 875 + 799 = 1674. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 16 × 91 = 1452. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 423 + 356 = 779. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 527 + 733 = 1260. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 36 × 49 = 1764. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 58 × 22 = 1276. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 92 × 35 = 3228. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 70 × 68 = 4760. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 33 × 66 = 2174. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 17 × 45 = 765. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 47 × 27 = 1269. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 82 × 65 = 5327. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 14 × 78 = 1092. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 252 + 335 = 584. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 557 + 229 = 785. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 17 × 26 = 446. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 94 × 86 = 8084. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 755 + 205 = 960. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 747 + 331 = 1073. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 807 + 325 = 1132. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 227 + 336 = 563. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 407 + 543 = 946. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 200 + 284 = 486. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 498 + 424 = 922. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 80 = 1280. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 43 × 37 = 1591. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 215 + 560 = 775. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 91 × 38 = 3458. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 69 × 24 = 1656. Correct or wrong? (a) wrong (b) correct

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