Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 790 · 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: 68 × 45 = 3060. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 676 + 666 = 1342. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 243 + 931 = 1174. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 554 + 438 = 992. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 617 + 462 = 1085. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 65 × 16 = 1045. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 218 + 361 = 579. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 47 = 3713. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 84 × 51 = 4276. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 57 × 96 = 5469. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 843 + 729 = 1579. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 508 + 760 = 1268. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 364 + 830 = 1194. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 64 × 69 = 4416. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 91 × 33 = 3001. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 884 + 937 = 1824. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 74 × 58 = 4292. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 213 + 292 = 508. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 18 × 25 = 448. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 38 × 27 = 1030. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 52 = 3637. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 257 + 919 = 1176. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 40 × 53 = 2120. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 19 × 47 = 893. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 261 + 213 = 474. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 507 + 707 = 1214. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 15 = 215. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 906 + 184 = 1090. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 26 × 83 = 2158. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 631 + 772 = 1403. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 36 = 1477. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 342 + 847 = 1189. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 96 × 56 = 5378. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 31 × 32 = 992. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 338 + 943 = 1281. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 34 × 15 = 504. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 59 × 52 = 3064. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 797 + 555 = 1352. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 565 + 863 = 1428. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 720 + 800 = 1520. Correct or wrong? (a) wrong (b) correct

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