Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 679 · 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: 497 + 327 = 824. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 529 + 282 = 819. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 16 × 34 = 549. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 644 + 458 = 1100. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 96 × 54 = 5184. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 320 + 413 = 733. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 38 × 26 = 994. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 425 + 394 = 819. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 71 × 59 = 4182. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 264 + 195 = 459. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 13 × 82 = 1066. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 327 + 927 = 1260. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 605 + 824 = 1427. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 67 × 51 = 3415. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 95 × 96 = 9120. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 95 × 30 = 2850. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 559 + 993 = 1554. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 277 + 920 = 1197. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 61 × 16 = 976. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 90 × 32 = 2886. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 25 × 82 = 2050. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 36 × 27 = 965. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 37 × 54 = 1998. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 170 + 389 = 560. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 20 × 19 = 380. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 319 + 836 = 1155. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 12 × 64 = 768. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 26 × 39 = 1011. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 72 × 14 = 1008. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 62 × 87 = 5388. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 528 + 691 = 1224. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 266 + 142 = 412. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 192 + 244 = 436. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 494 + 900 = 1389. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 228 + 332 = 560. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 346 + 740 = 1094. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 43 × 41 = 1770. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 398 + 434 = 832. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 409 + 588 = 997. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 844 + 491 = 1335. Correct or wrong? (a) correct (b) wrong

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