Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 712 · 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: 79 × 88 = 6952. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 679 + 903 = 1584. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 300 + 481 = 781. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 85 × 50 = 4250. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 97 × 92 = 8920. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 353 + 854 = 1201. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 57 × 35 = 1987. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 26 × 89 = 2314. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 178 + 329 = 504. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 97 × 22 = 2134. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 269 + 879 = 1152. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 242 + 368 = 616. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 313 + 970 = 1283. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 716 + 806 = 1522. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 544 + 231 = 775. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 30 × 83 = 2490. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 819 + 837 = 1663. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 28 × 67 = 1876. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 358 + 523 = 873. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 28 × 22 = 616. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 45 × 28 = 1253. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 422 + 331 = 753. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 50 × 47 = 2350. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 86 × 98 = 8428. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 65 × 63 = 4101. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 307 + 174 = 483. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 27 × 89 = 2403. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 269 + 502 = 766. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 331 + 226 = 557. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 925 + 917 = 1850. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 813 + 800 = 1614. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 57 × 46 = 2621. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 439 + 907 = 1342. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 81 × 31 = 2511. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 362 + 327 = 689. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 56 × 36 = 2013. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 866 + 406 = 1272. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 883 + 249 = 1138. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 765 + 510 = 1278. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 269 + 632 = 899. Correct or wrong? (a) correct (b) wrong

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