Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 217 · 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: 33 × 32 = 1056. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 15 × 35 = 517. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 27 × 27 = 733. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 227 + 823 = 1043. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 288 + 569 = 852. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 93 × 65 = 6042. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 153 + 448 = 606. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 46 × 82 = 3776. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 26 × 94 = 2444. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 20 × 64 = 1274. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 34 × 59 = 2006. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 378 + 507 = 885. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 489 + 395 = 881. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 32 × 78 = 2496. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 86 × 38 = 3268. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 190 + 897 = 1087. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 28 × 85 = 2380. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 182 + 279 = 463. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 17 × 22 = 378. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 97 × 70 = 6790. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 686 + 518 = 1204. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 662 + 788 = 1444. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 754 + 880 = 1634. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 52 × 67 = 3484. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 324 + 458 = 782. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 18 × 84 = 1512. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 47 × 77 = 3612. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 359 + 583 = 943. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 160 + 174 = 337. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 46 × 84 = 3862. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 332 + 291 = 630. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 49 × 78 = 3822. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 301 + 762 = 1058. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 19 × 13 = 247. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 23 × 13 = 299. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 503 + 295 = 804. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 81 × 30 = 2430. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 481 + 696 = 1177. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 643 + 333 = 976. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 332 + 632 = 964. Correct or wrong? (a) correct (b) wrong

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