Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 439 · 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: 716 + 605 = 1321. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 427 + 252 = 685. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 64 × 12 = 774. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 655 + 344 = 1006. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 735 + 458 = 1193. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 89 × 39 = 3478. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 415 + 697 = 1112. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 608 + 202 = 810. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 979 + 705 = 1679. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 36 × 88 = 3168. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 90 × 91 = 8190. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 172 + 120 = 292. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 735 + 827 = 1562. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 48 × 16 = 765. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 12 × 36 = 440. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 475 + 203 = 678. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 76 × 59 = 4487. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 708 + 197 = 897. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 26 × 64 = 1664. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 88 × 28 = 2463. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 72 × 98 = 7062. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 48 × 51 = 2448. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 519 + 933 = 1452. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 324 + 628 = 959. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 912 + 181 = 1093. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 84 × 95 = 7987. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 184 + 199 = 383. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 44 × 59 = 2592. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 20 × 52 = 1037. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 33 × 56 = 1845. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 837 + 811 = 1648. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 15 × 30 = 450. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 446 + 423 = 869. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 51 × 56 = 2862. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 272 + 397 = 671. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 195 + 401 = 590. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 919 + 449 = 1368. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 79 × 16 = 1268. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 671 + 440 = 1109. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 257 + 549 = 806. Correct or wrong? (a) wrong (b) correct

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