Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 941 · 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: 48 × 98 = 4704. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 186 + 276 = 462. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 203 + 872 = 1083. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 268 + 903 = 1171. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 729 + 664 = 1393. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 17 × 53 = 907. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 95 × 76 = 7220. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 74 × 87 = 6438. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 23 × 66 = 1526. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 37 × 32 = 1192. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 49 × 68 = 3329. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 45 × 54 = 2430. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 93 × 70 = 6510. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 26 × 28 = 728. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 856 + 840 = 1688. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 99 × 72 = 7131. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 877 + 935 = 1813. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 36 × 98 = 3528. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 91 × 28 = 2549. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 614 + 153 = 759. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 927 + 386 = 1313. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 48 × 78 = 3742. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 886 + 941 = 1827. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 151 + 689 = 840. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 223 + 370 = 601. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 55 × 38 = 2096. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 863 + 866 = 1729. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 585 + 404 = 989. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 60 × 68 = 4078. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 28 × 18 = 505. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 42 × 34 = 1428. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 34 × 20 = 675. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 89 × 53 = 4717. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 86 × 66 = 5676. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 19 × 19 = 361. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 61 × 62 = 3775. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 53 × 41 = 2173. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 195 + 838 = 1040. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 87 × 52 = 4518. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 943 + 736 = 1679. Correct or wrong? (a) wrong (b) correct

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