Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 280 · 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: 188 + 462 = 650. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 95 × 67 = 6365. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 458 + 320 = 783. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 40 × 30 = 1196. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 644 + 458 = 1102. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 41 × 12 = 492. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 277 + 346 = 618. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 46 × 14 = 648. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 680 + 894 = 1574. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 72 × 32 = 2304. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 510 + 309 = 819. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 82 × 67 = 5502. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 42 × 19 = 798. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 30 × 70 = 2100. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 33 × 50 = 1643. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 74 × 77 = 5698. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 708 + 795 = 1506. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 424 + 924 = 1341. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 36 × 95 = 3420. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 98 × 88 = 8627. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 88 × 69 = 6072. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 963 + 717 = 1678. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 167 + 722 = 891. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 605 + 846 = 1443. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 12 × 63 = 756. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 814 + 294 = 1108. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 666 + 794 = 1467. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 466 + 346 = 806. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 303 + 402 = 705. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 35 × 45 = 1575. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 90 × 72 = 6480. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 948 + 239 = 1185. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 26 × 20 = 517. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 54 × 98 = 5291. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 71 × 86 = 6106. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 18 × 24 = 432. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 288 + 131 = 419. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 24 × 49 = 1176. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 282 + 714 = 994. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 38 × 65 = 2470. Correct or wrong? (a) correct (b) wrong

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