Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 569 · 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: 76 × 32 = 2432. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 58 × 58 = 3359. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 68 × 24 = 1632. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 85 = 2125. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 78 × 94 = 7332. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 60 × 47 = 2820. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 850 + 977 = 1826. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 926 + 159 = 1085. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 48 × 67 = 3214. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 389 + 867 = 1252. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 55 × 21 = 1155. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 82 × 40 = 3280. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 307 + 969 = 1271. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 682 + 717 = 1399. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 612 + 977 = 1585. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 28 × 74 = 2067. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 73 × 28 = 2051. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 683 + 930 = 1612. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 782 + 870 = 1650. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 90 × 39 = 3502. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 306 + 179 = 482. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 360 + 224 = 584. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 89 × 95 = 8455. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 82 × 33 = 2707. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 859 + 409 = 1264. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 94 × 14 = 1316. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 46 × 61 = 2806. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 94 × 37 = 3482. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 14 × 21 = 294. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 190 + 136 = 326. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 645 + 502 = 1147. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 195 + 485 = 680. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 58 × 28 = 1624. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 467 + 310 = 777. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 408 + 273 = 673. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 35 × 93 = 3257. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 262 + 265 = 527. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 23 × 24 = 552. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 37 × 15 = 563. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 530 + 243 = 777. Correct or wrong? (a) correct (b) wrong

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