Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 367 · 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: 85 × 80 = 6800. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 185 + 296 = 483. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 343 + 206 = 549. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 30 × 89 = 2676. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 790 + 309 = 1104. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 300 + 258 = 560. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 602 + 287 = 889. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 22 × 75 = 1653. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 742 + 478 = 1225. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 63 × 57 = 3591. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 13 × 59 = 761. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 77 × 89 = 6857. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 12 × 89 = 1075. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 618 + 620 = 1234. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 456 + 802 = 1266. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 145 + 820 = 965. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 19 × 77 = 1469. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 85 × 15 = 1275. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 26 × 16 = 413. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 49 × 28 = 1370. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 81 × 21 = 1706. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 95 × 72 = 6846. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 164 + 969 = 1133. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 58 × 49 = 2836. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 35 × 87 = 3041. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 37 × 54 = 2000. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 501 + 956 = 1457. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 913 + 759 = 1672. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 62 × 78 = 4838. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 29 × 15 = 435. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 510 + 825 = 1330. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 75 × 36 = 2699. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 642 + 198 = 840. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 593 + 347 = 940. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 748 + 768 = 1516. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 516 + 153 = 669. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 458 + 882 = 1340. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 19 × 82 = 1559. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 21 × 84 = 1763. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 281 + 471 = 752. Correct or wrong? (a) correct (b) wrong

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