Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 98 · 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: 97 × 99 = 9602. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 933 + 388 = 1321. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 472 + 175 = 647. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 78 × 28 = 2184. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 79 × 14 = 1106. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 44 × 30 = 1326. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 163 + 368 = 537. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 203 + 634 = 836. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 131 + 163 = 302. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 934 + 653 = 1595. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 518 + 191 = 713. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 863 + 264 = 1127. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 679 + 525 = 1206. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 23 × 14 = 322. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 596 + 685 = 1286. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 411 + 853 = 1264. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 33 × 83 = 2739. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 238 + 745 = 983. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 24 × 34 = 823. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 60 × 51 = 3060. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 70 × 17 = 1190. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 30 × 76 = 2276. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 85 × 59 = 5017. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 938 + 473 = 1411. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 174 + 491 = 665. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 29 × 65 = 1885. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 55 × 47 = 2592. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 19 × 79 = 1499. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 562 + 368 = 928. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 694 + 911 = 1607. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 679 + 993 = 1675. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 854 + 270 = 1125. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 76 × 56 = 4258. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 327 + 652 = 987. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 52 × 95 = 4934. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 27 × 28 = 756. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 952 + 444 = 1396. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 370 + 769 = 1137. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 265 + 843 = 1110. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 79 × 52 = 4108. Correct or wrong? (a) correct (b) wrong

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