Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 904 · 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: 821 + 520 = 1341. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 94 × 86 = 8084. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 33 × 42 = 1386. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 992 + 388 = 1381. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 25 × 50 = 1243. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 87 × 79 = 6873. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 849 + 282 = 1133. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 967 + 152 = 1117. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 139 + 433 = 572. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 152 + 854 = 1006. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 335 + 437 = 772. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 751 + 344 = 1095. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 550 + 405 = 951. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 16 × 87 = 1392. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 989 + 345 = 1329. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 655 + 373 = 1028. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 368 + 786 = 1154. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 20 × 78 = 1554. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 747 + 340 = 1087. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 79 × 70 = 5530. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 96 × 77 = 7385. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 182 + 512 = 694. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 283 + 838 = 1121. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 803 + 352 = 1159. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 940 + 496 = 1430. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 64 × 99 = 6338. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 515 + 160 = 675. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 281 + 871 = 1149. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 456 + 796 = 1246. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 45 × 18 = 803. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 779 + 603 = 1390. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 59 × 99 = 5845. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 91 × 91 = 8281. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 34 × 59 = 2006. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 443 + 437 = 880. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 66 × 47 = 3102. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 332 + 292 = 621. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 20 × 26 = 528. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 95 × 55 = 5225. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 95 × 53 = 5032. Correct or wrong? (a) correct (b) wrong

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