Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 538 · 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: 348 + 214 = 558. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 760 + 165 = 925. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 62 × 65 = 4030. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 395 + 410 = 805. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 681 + 967 = 1648. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 78 × 73 = 5694. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 98 × 43 = 4218. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 32 × 33 = 1056. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 187 + 233 = 420. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 453 + 818 = 1271. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 337 + 655 = 984. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 847 + 441 = 1283. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 423 + 593 = 1009. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 211 + 506 = 717. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 72 × 36 = 2584. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 86 × 58 = 4988. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 70 × 69 = 4830. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 183 + 606 = 789. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 88 × 32 = 2816. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 64 × 30 = 1920. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 685 + 676 = 1369. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 811 + 938 = 1752. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 69 × 24 = 1652. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 264 + 649 = 920. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 743 + 999 = 1735. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 15 × 89 = 1335. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 62 × 78 = 4836. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 40 × 23 = 920. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 970 + 926 = 1896. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 71 × 46 = 3263. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 395 + 957 = 1352. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 812 + 314 = 1126. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 18 × 90 = 1620. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 959 + 685 = 1644. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 56 × 40 = 2240. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 43 × 96 = 4128. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 882 + 287 = 1169. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 709 + 988 = 1697. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 24 × 23 = 558. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 158 + 286 = 449. Correct or wrong? (a) correct (b) wrong

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