Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 371 · 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: 305 + 162 = 474. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 63 × 66 = 4150. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 525 + 208 = 733. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 15 × 23 = 345. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 64 × 96 = 6144. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 871 + 350 = 1213. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 82 × 33 = 2707. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 130 + 383 = 513. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 478 + 754 = 1232. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 255 + 318 = 573. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 878 + 735 = 1613. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 77 × 28 = 2149. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 45 × 75 = 3377. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 21 × 87 = 1834. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 52 × 32 = 1660. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 58 × 66 = 3835. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 78 × 57 = 4438. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 14 × 63 = 882. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 20 × 12 = 242. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 704 + 278 = 974. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 44 × 63 = 2773. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 622 + 942 = 1564. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 348 + 433 = 789. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 419 + 400 = 815. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 805 + 755 = 1564. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 69 × 37 = 2553. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 302 + 194 = 494. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 65 × 70 = 4550. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 768 + 534 = 1302. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 31 × 45 = 1390. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 431 + 937 = 1368. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 58 × 15 = 872. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 809 + 370 = 1179. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 22 × 90 = 1982. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 506 + 689 = 1195. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 800 + 173 = 973. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 788 + 356 = 1148. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 95 × 62 = 5890. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 43 × 37 = 1586. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 89 × 40 = 3560. Correct or wrong? (a) correct (b) wrong

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