Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 324 · 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: 480 + 960 = 1440. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 66 × 16 = 1056. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 63 × 56 = 3528. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 531 + 166 = 697. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 722 + 731 = 1459. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 32 × 27 = 864. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 306 + 852 = 1164. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 58 × 69 = 3996. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 154 + 237 = 391. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 175 + 934 = 1109. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 57 × 40 = 2280. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 81 × 97 = 7850. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 255 + 132 = 387. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 17 × 65 = 1105. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 78 × 57 = 4446. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 425 + 787 = 1212. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 85 × 14 = 1190. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 872 + 585 = 1457. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 387 + 407 = 794. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 751 + 712 = 1464. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 967 + 362 = 1336. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 460 + 826 = 1286. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 860 + 917 = 1775. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 879 + 270 = 1151. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 939 + 875 = 1814. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 92 × 54 = 4968. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 381 + 661 = 1045. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 83 × 42 = 3487. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 848 + 620 = 1461. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 237 + 919 = 1156. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 49 × 46 = 2252. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 967 + 797 = 1766. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 17 × 95 = 1619. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 84 × 45 = 3780. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 24 × 66 = 1583. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 16 × 14 = 224. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 36 × 33 = 1188. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 170 + 332 = 502. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 983 + 491 = 1474. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 199 + 806 = 1012. Correct or wrong? (a) wrong (b) correct

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