Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 471 · 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: 914 + 328 = 1242. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 183 + 172 = 350. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 27 × 59 = 1593. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 210 + 946 = 1148. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 231 + 867 = 1098. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 865 + 868 = 1733. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 711 + 216 = 927. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 20 = 1577. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 737 + 241 = 982. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 634 + 492 = 1125. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 354 + 991 = 1343. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 16 = 1581. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 772 + 154 = 926. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 647 + 483 = 1123. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 50 × 52 = 2600. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 320 + 240 = 560. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 373 + 679 = 1059. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 84 × 37 = 3108. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 71 × 88 = 6245. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 19 × 65 = 1229. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 80 × 26 = 2076. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 608 + 985 = 1593. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 414 + 493 = 911. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 39 × 85 = 3315. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 201 + 282 = 483. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 40 × 40 = 1604. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 16 × 68 = 1094. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 16 × 80 = 1280. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 59 × 25 = 1483. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 706 + 151 = 863. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 833 + 568 = 1401. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 57 × 84 = 4788. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 857 + 366 = 1224. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 37 × 34 = 1253. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 68 × 75 = 5100. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 40 × 55 = 2197. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 39 × 70 = 2730. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 719 + 467 = 1186. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 568 + 682 = 1250. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 904 + 617 = 1514. Correct or wrong? (a) correct (b) wrong

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