Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 310 · 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: 69 × 52 = 3588. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 35 × 89 = 3115. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 48 × 69 = 3312. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 168 + 200 = 366. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 737 + 599 = 1336. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 40 = 1200. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 92 × 34 = 3134. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 42 × 37 = 1551. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 839 + 516 = 1355. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 92 × 73 = 6716. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 43 × 85 = 3655. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 64 × 42 = 2693. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 725 + 270 = 995. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 99 × 35 = 3457. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 41 × 38 = 1558. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 714 + 580 = 1294. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 57 × 49 = 2796. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 443 + 233 = 676. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 990 + 550 = 1542. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 761 + 411 = 1165. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 414 + 968 = 1383. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 21 × 79 = 1659. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 85 × 20 = 1700. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 17 × 92 = 1564. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 35 × 49 = 1715. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 52 × 96 = 4992. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 985 + 245 = 1234. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 98 × 15 = 1465. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 67 × 92 = 6164. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 32 × 98 = 3129. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 864 + 812 = 1676. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 350 + 184 = 539. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 423 + 324 = 747. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 32 × 89 = 2848. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 72 × 92 = 6630. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 346 + 595 = 941. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 12 × 38 = 456. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 32 × 48 = 1536. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 413 + 748 = 1161. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 865 + 572 = 1436. Correct or wrong? (a) wrong (b) correct

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