Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 319 · 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: 90 × 64 = 5759. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 47 × 95 = 4465. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 73 × 77 = 5622. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 32 × 70 = 2239. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 528 + 587 = 1121. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 96 × 27 = 2592. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 152 + 963 = 1115. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 99 × 45 = 4456. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 139 + 609 = 740. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 59 × 28 = 1658. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 45 × 27 = 1215. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 630 + 570 = 1204. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 375 + 795 = 1167. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 345 + 973 = 1312. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 30 × 31 = 930. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 899 + 550 = 1449. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 328 + 563 = 899. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 97 × 76 = 7372. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 397 + 186 = 586. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 625 + 624 = 1250. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 35 × 33 = 1155. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 47 × 89 = 4183. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 50 × 66 = 3292. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 65 × 17 = 1105. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 943 + 288 = 1231. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 208 + 728 = 936. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 19 × 38 = 722. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 76 × 86 = 6536. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 579 + 640 = 1219. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 137 + 266 = 403. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 54 × 93 = 5022. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 93 × 97 = 9025. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 454 + 806 = 1260. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 634 + 424 = 1059. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 55 × 58 = 3191. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 661 + 370 = 1031. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 830 + 843 = 1665. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 83 × 95 = 7887. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 13 = 1222. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 559 + 503 = 1062. Correct or wrong? (a) wrong (b) correct

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