Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 407 · 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: 83 × 95 = 7885. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 527 + 682 = 1201. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 75 × 14 = 1051. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 47 × 54 = 2533. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 94 × 77 = 7238. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 575 + 699 = 1274. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 320 + 477 = 797. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 611 + 317 = 928. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 508 + 590 = 1096. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 69 × 23 = 1587. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 204 + 709 = 913. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 241 + 185 = 426. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 962 + 247 = 1209. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 551 + 585 = 1136. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 813 + 701 = 1514. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 133 + 163 = 296. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 44 × 46 = 2020. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 229 + 598 = 827. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 260 + 870 = 1122. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 197 + 155 = 350. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 662 + 146 = 808. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 725 + 470 = 1203. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 57 × 63 = 3593. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 878 + 561 = 1439. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 351 + 845 = 1196. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 426 + 282 = 702. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 788 + 576 = 1371. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 72 × 23 = 1657. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 433 + 578 = 1011. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 60 × 58 = 3480. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 983 + 748 = 1731. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 33 × 72 = 2376. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 669 + 784 = 1459. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 138 + 662 = 800. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 854 + 480 = 1333. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 156 + 676 = 832. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 69 × 48 = 3312. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 178 + 240 = 418. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 620 + 751 = 1371. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 322 + 952 = 1275. Correct or wrong? (a) correct (b) wrong

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