Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 474 · 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: 51 × 73 = 3723. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 81 × 67 = 5427. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 62 × 24 = 1488. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 25 × 45 = 1125. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 390 + 651 = 1040. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 449 + 213 = 660. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 123 + 302 = 418. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 686 + 664 = 1350. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 337 + 391 = 722. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 391 + 697 = 1090. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 17 × 61 = 1037. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 99 × 57 = 5643. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 95 × 17 = 1615. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 391 + 628 = 1024. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 806 + 729 = 1528. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 73 × 92 = 6716. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 345 + 263 = 616. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 481 + 736 = 1217. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 953 + 781 = 1729. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 21 × 67 = 1403. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 935 + 480 = 1415. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 45 × 97 = 4358. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 248 + 691 = 943. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 66 × 36 = 2373. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 22 × 53 = 1158. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 63 × 30 = 1890. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 352 + 193 = 537. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 788 + 167 = 955. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 417 + 364 = 781. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 96 × 75 = 7200. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 999 + 688 = 1686. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 239 + 872 = 1111. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 50 × 12 = 596. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 68 × 43 = 2924. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 37 × 82 = 3029. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 618 + 548 = 1160. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 31 × 78 = 2418. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 770 + 513 = 1277. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 870 + 671 = 1541. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 663 + 628 = 1283. Correct or wrong? (a) wrong (b) correct

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