Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 838 · 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: 88 × 36 = 3164. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 245 + 574 = 819. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 26 × 17 = 442. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 224 + 227 = 451. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 86 × 30 = 2577. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 792 + 564 = 1355. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 41 × 89 = 3649. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 164 + 252 = 410. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 81 × 65 = 5265. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 24 × 15 = 363. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 14 × 92 = 1286. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 22 × 97 = 2134. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 758 + 954 = 1718. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 146 + 230 = 374. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 272 + 881 = 1149. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 361 + 675 = 1036. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 17 × 33 = 563. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 524 + 183 = 709. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 95 × 20 = 1900. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 41 × 44 = 1805. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 460 + 813 = 1265. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 246 + 315 = 565. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 18 × 82 = 1476. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 96 × 73 = 7008. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 79 × 13 = 1022. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 17 × 42 = 714. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 72 × 93 = 6696. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 614 + 661 = 1275. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 155 + 603 = 758. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 93 × 81 = 7533. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 89 × 19 = 1691. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 37 × 38 = 1405. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 70 × 23 = 1609. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 41 × 69 = 2829. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 36 × 29 = 1044. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 581 + 209 = 790. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 58 × 31 = 1798. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 515 + 996 = 1513. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 994 + 607 = 1594. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 12 × 62 = 746. Correct or wrong? (a) correct (b) wrong

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