Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 849 · 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: 450 + 962 = 1412. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 50 = 4553. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 29 × 47 = 1369. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 33 × 64 = 2112. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 27 × 62 = 1674. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 799 + 243 = 1034. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 90 × 15 = 1347. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 44 × 64 = 2816. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 25 × 57 = 1430. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 89 × 92 = 8188. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 41 × 30 = 1226. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 49 × 15 = 735. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 41 × 24 = 987. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 33 × 81 = 2667. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 605 + 214 = 818. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 98 × 89 = 8717. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 59 × 34 = 2006. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 685 + 631 = 1312. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 29 × 47 = 1363. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 526 + 932 = 1458. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 32 × 31 = 993. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 209 + 545 = 754. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 34 × 73 = 2481. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 26 × 97 = 2522. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 13 × 93 = 1209. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 79 × 37 = 2931. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 266 + 981 = 1246. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 67 × 77 = 5159. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 46 × 79 = 3634. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 923 + 850 = 1776. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 81 × 51 = 4132. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 950 + 741 = 1684. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 66 × 20 = 1323. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 814 + 408 = 1222. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 839 + 821 = 1660. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 314 + 408 = 728. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 980 + 918 = 1898. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 25 × 81 = 2025. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 26 × 83 = 2163. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 695 + 824 = 1521. Correct or wrong? (a) correct (b) wrong

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