Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 450 · 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: 527 + 703 = 1238. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 343 + 541 = 885. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 43 × 73 = 3146. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 829 + 268 = 1092. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 89 × 76 = 6764. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 23 × 35 = 805. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 63 × 84 = 5292. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 250 + 860 = 1110. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 372 + 598 = 970. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 627 + 680 = 1307. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 67 × 30 = 2010. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 82 × 37 = 3042. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 91 × 41 = 3731. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 890 + 948 = 1832. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 552 + 169 = 721. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 46 × 70 = 3220. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 57 × 77 = 4384. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 65 × 34 = 2218. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 32 = 2080. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 92 × 54 = 4968. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 78 × 14 = 1089. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 302 + 133 = 435. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 729 + 588 = 1317. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 808 + 564 = 1372. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 99 × 63 = 6237. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 91 × 25 = 2275. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 358 + 645 = 1011. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 678 + 872 = 1548. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 47 × 39 = 1833. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 80 × 19 = 1520. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 857 + 792 = 1649. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 517 + 827 = 1344. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 457 + 825 = 1282. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 807 + 231 = 1037. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 29 × 98 = 2843. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 353 + 272 = 630. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 216 + 702 = 918. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 37 × 85 = 3145. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 557 + 251 = 808. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 305 + 253 = 563. Correct or wrong? (a) correct (b) wrong

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