Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 957 · 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: 44 × 91 = 4006. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 76 × 58 = 4408. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 44 × 50 = 2200. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 464 + 857 = 1315. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 13 × 78 = 1019. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 54 × 27 = 1458. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 63 × 77 = 4851. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 127 + 624 = 751. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 19 × 67 = 1267. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 22 × 21 = 458. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 21 × 43 = 903. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 150 + 355 = 505. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 20 × 94 = 1880. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 34 × 65 = 2210. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 285 + 817 = 1102. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 172 + 740 = 912. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 238 + 488 = 726. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 759 + 454 = 1213. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 373 + 521 = 902. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 63 × 84 = 5292. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 48 × 65 = 3125. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 558 + 994 = 1552. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 28 × 35 = 980. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 153 + 179 = 339. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 42 × 49 = 2062. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 28 × 88 = 2464. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 51 × 81 = 4131. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 428 + 311 = 739. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 68 = 3129. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 21 × 99 = 2079. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 704 + 356 = 1060. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 441 + 806 = 1247. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 36 × 73 = 2623. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 566 + 434 = 1000. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 884 + 949 = 1833. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 431 + 558 = 989. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 210 + 594 = 800. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 560 + 294 = 854. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 78 × 47 = 3670. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 195 + 705 = 903. Correct or wrong? (a) wrong (b) correct

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