Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 726 · 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: 536 + 481 = 1017. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 244 + 514 = 764. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 81 × 46 = 3726. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 66 × 93 = 6131. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 39 × 22 = 858. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 12 × 41 = 492. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 59 × 56 = 3299. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 957 + 274 = 1228. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 40 × 29 = 1161. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 47 × 57 = 2684. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 843 + 950 = 1793. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 16 × 64 = 1024. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 87 × 80 = 6960. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 33 × 39 = 1287. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 19 × 85 = 1623. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 77 × 43 = 3313. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 314 + 719 = 1035. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 71 × 41 = 2911. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 707 + 597 = 1298. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 46 × 29 = 1334. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 13 × 17 = 221. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 53 × 33 = 1749. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 62 × 70 = 4337. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 635 + 990 = 1629. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 46 × 25 = 1150. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 902 + 270 = 1172. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 698 + 570 = 1268. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 313 + 352 = 665. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 914 + 850 = 1768. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 31 × 15 = 465. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 35 × 42 = 1467. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 703 + 472 = 1175. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 29 × 19 = 551. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 978 + 300 = 1278. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 663 + 994 = 1662. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 219 + 891 = 1115. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 73 × 64 = 4672. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 90 × 35 = 3151. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 821 + 765 = 1580. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 271 + 755 = 1026. Correct or wrong? (a) correct (b) wrong

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