Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 618 · 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: 21 × 14 = 294. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 175 + 266 = 439. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 31 × 75 = 2325. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 21 × 60 = 1259. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 93 × 24 = 2232. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 972 + 248 = 1227. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 445 + 969 = 1422. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 35 × 22 = 770. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 814 + 237 = 1051. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 85 × 63 = 5347. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 363 + 993 = 1356. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 76 × 76 = 5776. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 38 × 30 = 1140. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 673 + 887 = 1559. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 684 + 770 = 1454. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 947 + 973 = 1913. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 13 × 28 = 364. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 18 × 89 = 1602. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 20 × 76 = 1520. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 335 + 395 = 730. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 837 + 847 = 1690. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 52 × 66 = 3432. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 22 × 28 = 622. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 32 × 43 = 1376. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 97 × 89 = 8633. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 669 + 555 = 1224. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 95 × 45 = 4275. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 15 × 60 = 900. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 35 × 14 = 492. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 264 + 799 = 1063. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 79 × 15 = 1183. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 84 × 95 = 7980. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 250 + 505 = 755. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 880 + 807 = 1687. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 35 × 96 = 3360. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 238 + 593 = 839. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 886 + 549 = 1431. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 36 × 17 = 612. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 96 × 85 = 8160. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 76 × 96 = 7298. Correct or wrong? (a) correct (b) wrong

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