Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 267 · 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: 370 + 308 = 671. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 175 + 217 = 399. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 74 × 71 = 5254. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 285 + 771 = 1059. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 54 × 85 = 4590. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 896 + 353 = 1249. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 874 + 320 = 1194. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 362 + 516 = 878. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 97 × 91 = 8821. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 38 × 64 = 2432. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 49 × 97 = 4760. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 49 × 21 = 1029. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 379 + 349 = 734. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 790 + 786 = 1576. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 16 × 61 = 976. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 645 + 976 = 1619. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 932 + 617 = 1549. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 33 × 79 = 2606. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 79 × 20 = 1580. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 857 + 238 = 1095. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 387 + 876 = 1263. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 50 × 84 = 4204. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 27 × 14 = 376. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 36 × 49 = 1764. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 33 × 28 = 924. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 59 × 70 = 4130. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 270 + 725 = 996. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 215 + 144 = 359. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 423 + 247 = 670. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 378 + 421 = 804. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 83 × 43 = 3565. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 53 × 42 = 2226. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 44 = 2552. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 447 + 536 = 983. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 94 × 35 = 3286. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 166 + 344 = 510. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 202 + 321 = 523. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 31 × 85 = 2635. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 16 × 75 = 1197. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 423 + 936 = 1359. Correct or wrong? (a) correct (b) wrong

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