Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 955 · 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: 93 × 75 = 6975. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 41 × 67 = 2744. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 88 × 32 = 2816. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 411 + 865 = 1279. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 196 + 136 = 332. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 76 × 26 = 1976. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 85 = 5786. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 770 + 736 = 1506. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 216 + 552 = 771. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 90 × 58 = 5220. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 840 + 125 = 965. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 75 × 75 = 5621. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 82 × 76 = 6224. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 71 × 27 = 1916. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 184 + 295 = 479. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 39 × 44 = 1716. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 43 × 32 = 1376. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 897 + 301 = 1195. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 213 + 821 = 1034. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 631 + 841 = 1472. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 649 + 661 = 1304. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 16 × 35 = 560. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 42 × 88 = 3695. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 380 + 323 = 703. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 40 × 46 = 1832. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 203 + 381 = 584. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 59 × 70 = 4130. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 404 + 273 = 677. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 129 + 815 = 944. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 22 × 30 = 660. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 14 = 392. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 18 × 87 = 1573. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 921 + 347 = 1274. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 979 + 488 = 1467. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 50 × 95 = 4748. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 91 × 90 = 8190. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 618 + 343 = 958. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 327 + 541 = 868. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 221 + 548 = 769. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 890 + 937 = 1827. Correct or wrong? (a) wrong (b) correct

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