Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 28 · 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: 49 × 29 = 1420. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 688 + 732 = 1420. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 878 + 928 = 1801. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 94 × 37 = 3470. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 71 × 48 = 3408. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 63 × 62 = 3910. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 259 + 279 = 540. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 446 + 986 = 1432. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 20 × 45 = 900. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 58 × 58 = 3369. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 50 × 16 = 800. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 84 × 20 = 1680. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 46 × 92 = 4232. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 13 × 52 = 676. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 194 + 187 = 381. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 51 × 31 = 1587. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 859 + 978 = 1837. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 12 × 91 = 1096. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 14 × 17 = 238. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 97 × 12 = 1164. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 15 × 95 = 1425. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 755 + 384 = 1144. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 56 × 71 = 3976. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 277 + 243 = 521. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 22 × 38 = 836. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 29 × 22 = 639. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 94 × 28 = 2632. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 294 + 697 = 991. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 919 + 287 = 1206. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 772 + 996 = 1765. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 52 × 85 = 4420. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 14 × 21 = 294. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 68 × 41 = 2788. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 49 × 67 = 3283. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 73 × 80 = 5840. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 542 + 469 = 1016. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 180 + 344 = 524. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 127 + 403 = 524. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 447 + 972 = 1426. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 193 + 678 = 871. Correct or wrong? (a) wrong (b) correct

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