Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 760 · 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: 43 × 54 = 2330. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 12 = 1100. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 47 = 759. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 55 × 94 = 5170. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 21 × 12 = 252. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 40 × 31 = 1237. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 27 × 68 = 1839. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 277 + 288 = 565. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 147 + 172 = 319. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 316 + 219 = 535. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 331 + 465 = 799. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 63 × 13 = 819. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 743 + 544 = 1284. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 508 + 949 = 1457. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 412 + 682 = 1095. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 62 × 58 = 3596. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 147 + 364 = 511. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 94 × 92 = 8651. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 816 + 911 = 1729. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 559 + 270 = 823. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 40 × 51 = 2040. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 66 × 27 = 1774. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 67 × 95 = 6365. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 56 × 51 = 2856. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 50 × 87 = 4350. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 63 × 21 = 1318. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 79 = 2135. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 306 + 225 = 531. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 968 + 590 = 1566. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 76 × 75 = 5706. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 41 × 78 = 3198. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 915 + 930 = 1846. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 419 + 515 = 934. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 971 + 251 = 1222. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 54 × 42 = 2268. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 777 + 469 = 1239. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 623 + 287 = 910. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 22 × 39 = 858. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 309 + 458 = 773. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 75 × 12 = 898. Correct or wrong? (a) correct (b) wrong

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