Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 706 · 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: 54 × 68 = 3676. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 81 × 45 = 3645. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 753 + 586 = 1345. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 42 × 20 = 840. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 14 × 60 = 833. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 36 × 97 = 3492. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 60 × 16 = 956. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 130 + 224 = 349. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 52 × 27 = 1404. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 473 + 304 = 777. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 272 + 321 = 593. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 294 + 314 = 608. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 68 × 69 = 4692. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 56 × 36 = 2016. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 67 × 82 = 5492. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 177 + 980 = 1157. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 92 × 33 = 3036. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 53 × 50 = 2650. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 742 + 437 = 1179. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 800 + 207 = 1013. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 72 × 31 = 2237. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 441 + 488 = 929. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 64 × 72 = 4608. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 93 × 15 = 1395. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 43 × 15 = 650. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 950 + 522 = 1467. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 37 × 96 = 3557. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 95 × 73 = 6935. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 786 + 978 = 1764. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 276 + 918 = 1194. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 827 + 786 = 1613. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 999 + 666 = 1658. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 611 + 735 = 1352. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 95 × 13 = 1235. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 30 × 89 = 2670. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 521 + 528 = 1049. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 57 × 57 = 3250. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 74 × 19 = 1406. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 79 × 82 = 6478. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 74 × 12 = 887. Correct or wrong? (a) wrong (b) correct

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