Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 652 · 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: 505 + 573 = 1078. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 916 + 749 = 1665. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 41 × 67 = 2747. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 76 × 75 = 5700. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 199 + 369 = 575. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 228 + 963 = 1183. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 220 + 388 = 609. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 640 + 533 = 1171. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 573 + 871 = 1444. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 27 × 80 = 2168. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 212 + 999 = 1211. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 702 + 228 = 930. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 48 × 81 = 3888. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 970 + 625 = 1595. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 170 + 776 = 952. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 25 × 93 = 2326. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 92 = 2668. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 249 + 130 = 379. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 87 × 32 = 2778. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 66 × 48 = 3168. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 701 + 884 = 1585. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 34 × 85 = 2888. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 35 × 45 = 1567. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 87 × 20 = 1738. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 249 + 960 = 1209. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 163 + 388 = 555. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 403 + 496 = 891. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 39 × 36 = 1411. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 242 + 867 = 1102. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 382 + 173 = 550. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 298 + 150 = 448. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 486 + 347 = 833. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 252 + 695 = 947. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 871 + 940 = 1806. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 39 × 57 = 2227. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 19 × 67 = 1273. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 285 + 238 = 529. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 41 × 89 = 3649. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 30 × 42 = 1263. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 69 × 70 = 4837. Correct or wrong? (a) wrong (b) correct

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