Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 718 · 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: 21 × 13 = 277. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 58 × 47 = 2724. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 994 + 795 = 1782. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 25 × 48 = 1197. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 67 × 63 = 4221. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 450 + 855 = 1305. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 339 + 318 = 657. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 59 × 82 = 4838. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 486 + 236 = 722. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 354 + 715 = 1061. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 39 × 55 = 2145. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 197 + 126 = 315. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 91 × 21 = 1919. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 20 × 76 = 1520. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 28 × 32 = 896. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 350 + 834 = 1184. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 193 + 252 = 445. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 766 + 930 = 1696. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 95 × 17 = 1615. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 37 × 14 = 525. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 550 + 881 = 1431. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 324 + 314 = 646. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 29 × 48 = 1384. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 314 + 623 = 936. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 39 × 38 = 1477. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 32 × 50 = 1600. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 882 + 685 = 1567. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 382 + 639 = 1021. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 51 × 77 = 3934. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 42 × 56 = 2350. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 849 + 355 = 1208. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 17 × 46 = 782. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 205 + 985 = 1187. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 18 × 64 = 1152. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 85 × 33 = 2805. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 786 + 651 = 1437. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 448 + 889 = 1337. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 395 + 554 = 947. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 952 + 478 = 1430. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 459 + 876 = 1335. Correct or wrong? (a) correct (b) wrong

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