Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 565 · 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: 40 × 71 = 2840. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 16 × 47 = 752. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 71 × 30 = 2130. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 94 × 41 = 3860. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 356 + 718 = 1077. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 395 + 913 = 1306. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 88 × 17 = 1496. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 874 + 442 = 1319. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 28 × 30 = 840. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 358 + 758 = 1116. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 703 + 542 = 1245. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 760 + 190 = 942. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 23 × 61 = 1411. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 86 × 97 = 8341. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 86 × 67 = 5767. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 515 + 448 = 971. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 62 × 92 = 5704. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 703 + 621 = 1322. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 41 × 30 = 1222. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 39 × 25 = 975. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 73 × 89 = 6495. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 560 + 157 = 717. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 13 × 34 = 442. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 152 + 706 = 850. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 182 + 246 = 429. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 152 + 134 = 282. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 58 × 62 = 3596. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 960 + 556 = 1517. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 17 × 84 = 1428. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 939 + 183 = 1122. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 162 + 796 = 958. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 67 × 82 = 5496. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 45 × 99 = 4455. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 143 + 379 = 516. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 546 + 471 = 1017. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 599 + 185 = 784. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 506 + 521 = 1026. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 86 × 31 = 2666. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 295 + 182 = 477. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 43 × 76 = 3267. Correct or wrong? (a) wrong (b) correct

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