Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 743 · 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: 42 × 17 = 708. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 93 × 34 = 3162. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 977 + 173 = 1149. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 90 × 51 = 4598. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 32 × 20 = 640. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 15 × 52 = 780. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 204 + 911 = 1107. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 27 × 93 = 2511. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 168 + 172 = 337. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 630 + 966 = 1596. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 997 + 862 = 1861. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 12 × 27 = 320. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 53 × 81 = 4301. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 529 + 316 = 845. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 127 + 263 = 390. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 13 × 70 = 910. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 298 + 696 = 996. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 35 × 23 = 813. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 86 × 70 = 6015. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 183 + 200 = 391. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 716 + 481 = 1198. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 490 + 718 = 1201. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 65 × 29 = 1885. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 373 + 889 = 1260. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 695 + 220 = 915. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 36 × 90 = 3245. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 176 + 334 = 510. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 974 + 179 = 1157. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 27 × 51 = 1370. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 208 + 854 = 1062. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 65 × 89 = 5793. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 70 × 65 = 4548. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 140 + 504 = 652. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 73 × 16 = 1163. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 167 + 568 = 737. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 734 + 159 = 899. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 57 × 48 = 2734. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 398 + 506 = 904. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 41 × 30 = 1230. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 21 × 81 = 1701. Correct or wrong? (a) correct (b) wrong

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