Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 389 · 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: 64 × 31 = 1986. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 245 + 601 = 846. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 15 × 61 = 918. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 44 × 57 = 2508. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 762 + 374 = 1132. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 54 × 89 = 4806. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 158 + 429 = 593. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 39 × 85 = 3311. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 85 × 15 = 1278. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 228 + 272 = 500. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 387 + 602 = 991. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 79 × 41 = 3242. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 668 + 560 = 1233. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 51 × 50 = 2555. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 82 × 63 = 5158. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 23 × 19 = 437. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 72 × 76 = 5464. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 79 × 53 = 4194. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 171 + 772 = 948. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 753 + 607 = 1358. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 176 + 354 = 524. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 67 × 89 = 5962. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 153 + 839 = 992. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 74 × 65 = 4810. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 947 + 504 = 1455. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 152 + 145 = 292. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 70 × 53 = 3710. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 50 × 88 = 4404. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 299 + 146 = 445. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 98 × 16 = 1571. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 67 × 46 = 3084. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 64 × 86 = 5504. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 248 + 266 = 514. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 967 + 238 = 1208. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 19 × 31 = 589. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 98 × 45 = 4410. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 24 × 50 = 1200. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 98 × 93 = 9120. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 353 + 217 = 565. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 19 × 86 = 1634. Correct or wrong? (a) correct (b) wrong

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