Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 741 · 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: 744 + 460 = 1206. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 74 × 42 = 3114. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 599 + 723 = 1324. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 483 + 841 = 1324. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 812 + 378 = 1192. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 94 = 5635. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 40 × 18 = 720. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 563 + 932 = 1495. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 75 × 25 = 1882. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 925 + 662 = 1594. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 144 + 229 = 373. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 34 × 26 = 881. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 763 + 181 = 944. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 20 × 28 = 565. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 49 × 71 = 3479. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 979 + 760 = 1734. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 546 + 506 = 1054. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 145 + 441 = 583. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 26 × 58 = 1508. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 27 × 19 = 510. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 786 + 964 = 1749. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 28 × 71 = 1980. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 690 + 913 = 1603. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 735 + 369 = 1103. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 422 + 179 = 601. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 475 + 193 = 668. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 17 × 91 = 1547. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 511 + 285 = 796. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 47 × 17 = 799. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 349 + 520 = 869. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 566 + 630 = 1189. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 591 + 404 = 995. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 302 + 864 = 1168. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 83 × 98 = 8140. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 38 × 35 = 1336. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 12 × 58 = 702. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 19 × 35 = 665. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 205 + 881 = 1080. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 234 + 269 = 503. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 32 × 44 = 1408. Correct or wrong? (a) wrong (b) correct

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