Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 566 · 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: 148 + 500 = 647. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 882 + 268 = 1150. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 601 + 367 = 966. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 305 + 232 = 539. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 187 + 860 = 1047. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 38 × 76 = 2888. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 82 × 28 = 2292. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 93 × 86 = 7998. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 88 × 32 = 2814. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 613 + 590 = 1205. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 827 + 259 = 1086. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 52 × 29 = 1508. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 62 × 30 = 1860. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 99 × 57 = 5643. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 545 + 583 = 1128. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 80 × 79 = 6320. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 13 × 69 = 897. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 307 + 896 = 1197. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 77 × 26 = 2005. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 68 × 89 = 6052. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 25 × 54 = 1350. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 22 × 62 = 1363. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 858 + 987 = 1848. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 496 + 571 = 1067. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 18 × 61 = 1097. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 59 × 84 = 4956. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 26 × 37 = 962. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 407 + 571 = 978. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 17 × 56 = 952. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 36 × 99 = 3564. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 533 + 923 = 1459. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 47 × 55 = 2585. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 49 × 69 = 3385. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 54 × 54 = 2915. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 82 × 89 = 7298. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 461 + 838 = 1299. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 950 + 873 = 1823. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 44 × 26 = 1144. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 33 × 48 = 1591. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 39 × 82 = 3198. Correct or wrong? (a) wrong (b) correct

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