Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 540 · 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: 750 + 139 = 889. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 416 + 706 = 1118. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 737 + 887 = 1628. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 72 × 78 = 5616. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 68 = 5447. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 50 × 14 = 705. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 512 + 339 = 849. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 33 × 67 = 2211. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 46 × 14 = 644. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 223 + 939 = 1170. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 201 + 720 = 921. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 535 + 917 = 1445. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 379 + 311 = 690. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 527 + 679 = 1205. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 536 + 278 = 813. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 46 × 35 = 1607. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 81 × 12 = 972. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 351 + 690 = 1047. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 556 + 263 = 819. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 736 + 246 = 982. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 21 × 27 = 568. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 36 × 20 = 712. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 96 × 91 = 8736. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 71 × 90 = 6390. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 20 × 32 = 640. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 65 × 33 = 2142. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 346 + 310 = 650. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 882 + 674 = 1556. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 938 + 676 = 1607. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 223 + 279 = 502. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 173 + 319 = 492. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 87 × 77 = 6699. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 29 × 51 = 1479. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 285 + 789 = 1074. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 50 × 55 = 2750. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 632 + 990 = 1614. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 187 + 240 = 427. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 50 × 36 = 1800. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 526 + 601 = 1131. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 420 + 895 = 1321. Correct or wrong? (a) correct (b) wrong

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