Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 151 · 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: 16 × 77 = 1232. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 42 × 15 = 630. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 94 × 43 = 4042. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 32 × 36 = 1152. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 94 × 15 = 1416. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 361 + 802 = 1163. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 59 × 98 = 5782. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 406 + 147 = 553. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 21 × 17 = 357. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 43 × 78 = 3354. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 92 × 77 = 7078. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 18 × 28 = 504. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 720 + 981 = 1695. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 63 × 84 = 5293. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 161 + 724 = 877. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 94 × 48 = 4512. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 18 × 43 = 775. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 40 × 58 = 2317. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 37 × 82 = 3030. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 475 + 269 = 744. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 19 × 57 = 1083. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 26 × 63 = 1646. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 52 × 44 = 2294. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 747 + 953 = 1698. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 35 × 35 = 1231. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 21 × 90 = 1896. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 323 + 338 = 661. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 905 + 605 = 1518. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 95 × 82 = 7790. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 544 + 705 = 1249. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 82 × 89 = 7298. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 47 × 22 = 1034. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 311 + 960 = 1271. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 276 + 219 = 503. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 32 × 15 = 482. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 453 + 300 = 761. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 35 × 57 = 1995. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 80 × 40 = 3199. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 37 × 27 = 1006. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 577 + 167 = 744. Correct or wrong? (a) wrong (b) correct

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