Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 674 · 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: 58 × 94 = 5457. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 174 + 154 = 328. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 26 × 13 = 330. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 17 × 77 = 1311. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 34 × 34 = 1149. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 901 + 233 = 1134. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 143 + 378 = 521. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 598 + 150 = 748. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 272 + 266 = 538. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 969 + 230 = 1199. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 61 × 35 = 2135. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 438 + 273 = 711. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 29 × 84 = 2436. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 73 × 35 = 2555. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 745 + 933 = 1678. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 93 × 32 = 2971. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 34 × 20 = 680. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 364 + 165 = 529. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 274 + 918 = 1194. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 13 × 33 = 426. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 84 × 19 = 1599. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 690 + 989 = 1679. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 768 + 406 = 1173. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 15 × 80 = 1202. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 652 + 180 = 824. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 20 × 85 = 1700. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 91 × 31 = 2819. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 855 + 140 = 995. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 75 × 49 = 3673. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 82 × 15 = 1230. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 28 × 96 = 2688. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 68 × 56 = 3809. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 19 × 35 = 665. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 36 × 68 = 2448. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 197 + 615 = 812. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 949 + 375 = 1324. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 889 + 644 = 1533. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 91 × 57 = 5181. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 289 + 422 = 711. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 511 + 761 = 1272. Correct or wrong? (a) correct (b) wrong

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