Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 654 · 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: 293 + 361 = 654. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 145 + 881 = 1033. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 55 × 81 = 4455. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 340 + 265 = 605. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 266 + 639 = 900. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 341 + 607 = 948. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 41 = 2785. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 15 × 95 = 1425. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 64 × 60 = 3840. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 449 + 264 = 713. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 944 + 998 = 1949. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 96 × 63 = 6048. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 409 + 844 = 1248. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 314 + 267 = 581. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 35 × 75 = 2629. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 193 + 991 = 1184. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 87 × 31 = 2698. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 18 × 56 = 1008. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 29 × 22 = 640. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 49 × 76 = 3724. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 309 + 689 = 999. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 592 + 713 = 1307. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 229 + 251 = 480. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 54 × 84 = 4536. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 410 + 531 = 935. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 40 × 38 = 1524. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 94 × 37 = 3486. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 60 × 72 = 4320. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 124 + 770 = 893. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 963 + 921 = 1884. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 953 + 845 = 1790. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 946 + 863 = 1809. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 29 × 12 = 346. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 351 + 191 = 538. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 36 × 40 = 1441. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 364 + 370 = 735. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 33 × 30 = 990. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 53 × 14 = 749. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 14 × 32 = 448. Correct or wrong? (a) correct (b) wrong

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