Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 388 · 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: 443 + 556 = 999. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 62 × 70 = 4340. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 499 + 321 = 818. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 145 + 378 = 523. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 660 + 626 = 1286. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 392 + 631 = 1023. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 28 × 22 = 610. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 959 + 276 = 1235. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 95 × 35 = 3325. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 99 × 50 = 4950. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 49 × 85 = 4163. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 13 × 94 = 1222. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 33 × 41 = 1351. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 92 × 98 = 9024. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 62 × 45 = 2785. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 293 + 583 = 876. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 978 + 560 = 1538. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 51 × 95 = 4847. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 257 + 754 = 1011. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 63 = 1134. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 38 × 68 = 2584. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 901 + 152 = 1053. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 61 × 62 = 3782. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 802 + 908 = 1711. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 83 × 41 = 3409. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 81 × 77 = 6237. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 93 × 43 = 4007. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 40 = 800. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 84 × 67 = 5625. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 371 + 133 = 504. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 759 + 998 = 1750. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 82 × 88 = 7218. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 46 × 94 = 4323. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 81 × 94 = 7614. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 43 × 20 = 860. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 392 + 268 = 658. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 606 + 251 = 857. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 37 × 50 = 1850. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 50 × 56 = 2800. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 77 × 79 = 6083. Correct or wrong? (a) correct (b) wrong

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