Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 256 · 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: 78 × 74 = 5768. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 25 × 14 = 350. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 176 + 879 = 1055. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 36 × 33 = 1188. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 20 × 55 = 1100. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 606 + 639 = 1253. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 810 + 788 = 1598. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 490 + 904 = 1393. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 14 × 15 = 214. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 422 + 909 = 1331. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 23 × 58 = 1334. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 76 × 28 = 2128. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 65 × 52 = 3380. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 37 × 56 = 2072. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 862 + 732 = 1594. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 42 × 23 = 968. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 827 + 630 = 1461. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 283 + 130 = 406. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 170 + 736 = 906. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 53 × 90 = 4770. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 581 + 134 = 707. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 391 + 993 = 1377. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 82 × 85 = 6970. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 15 × 87 = 1302. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 196 + 900 = 1096. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 687 + 715 = 1396. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 41 × 28 = 1148. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 13 × 33 = 429. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 48 × 35 = 1680. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 288 + 515 = 798. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 48 × 22 = 1061. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 184 + 155 = 332. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 54 × 96 = 5184. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 485 + 886 = 1371. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 83 × 75 = 6225. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 63 × 14 = 887. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 96 × 36 = 3456. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 745 + 780 = 1525. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 87 × 28 = 2432. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 211 + 995 = 1206. Correct or wrong? (a) correct (b) wrong

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