Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 578 · 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: 34 × 12 = 414. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 61 × 43 = 2617. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 664 + 729 = 1395. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 65 × 35 = 2283. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 80 × 68 = 5440. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 187 + 435 = 622. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 643 + 544 = 1188. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 37 × 80 = 2960. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 37 × 92 = 3407. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 28 × 77 = 2157. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 609 + 345 = 946. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 86 × 42 = 3613. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 86 × 73 = 6278. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 47 × 83 = 3899. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 283 + 978 = 1261. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 902 + 314 = 1215. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 52 × 37 = 1924. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 24 × 78 = 1878. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 255 + 694 = 947. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 57 × 92 = 5239. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 54 × 27 = 1464. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 85 × 82 = 6970. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 758 + 300 = 1058. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 79 × 32 = 2535. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 703 + 623 = 1326. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 90 × 78 = 7020. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 72 × 83 = 5976. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 25 × 59 = 1472. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 360 + 974 = 1332. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 877 + 546 = 1423. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 839 + 526 = 1363. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 43 × 76 = 3268. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 83 × 77 = 6395. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 181 + 468 = 641. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 751 + 789 = 1540. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 16 × 77 = 1231. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 64 × 38 = 2432. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 12 × 16 = 192. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 24 × 45 = 1080. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 386 + 143 = 531. Correct or wrong? (a) correct (b) wrong

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