Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 164 · 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: 27 × 78 = 2105. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 19 × 43 = 812. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 819 + 681 = 1500. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 228 + 215 = 435. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 767 + 527 = 1294. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 51 × 77 = 3928. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 972 + 353 = 1327. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 48 × 50 = 2401. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 694 + 251 = 945. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 65 × 16 = 1048. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 330 + 294 = 631. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 363 + 455 = 822. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 276 + 650 = 926. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 85 × 58 = 4930. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 89 × 25 = 2218. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 411 + 737 = 1148. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 52 × 23 = 1189. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 58 × 16 = 926. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 790 + 538 = 1328. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 39 × 87 = 3387. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 820 + 835 = 1652. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 44 × 17 = 750. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 25 × 15 = 375. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 986 + 234 = 1228. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 808 + 583 = 1385. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 292 + 140 = 432. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 91 = 2457. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 434 + 809 = 1243. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 49 × 51 = 2499. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 253 + 627 = 880. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 17 × 92 = 1568. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 58 × 70 = 4059. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 353 + 764 = 1117. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 91 × 61 = 5551. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 332 + 710 = 1042. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 48 × 70 = 3360. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 661 + 584 = 1245. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 182 + 286 = 466. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 41 × 95 = 3900. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 931 + 505 = 1437. Correct or wrong? (a) correct (b) wrong

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