Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 463 · 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: 64 × 24 = 1538. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 58 × 93 = 5394. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 512 + 423 = 935. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 473 + 363 = 831. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 46 × 16 = 736. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 912 + 541 = 1456. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 207 + 574 = 781. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 779 + 900 = 1679. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 15 × 44 = 660. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 52 × 85 = 4420. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 23 × 69 = 1589. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 97 × 99 = 9603. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 17 × 15 = 255. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 885 + 200 = 1085. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 19 × 27 = 513. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 508 + 571 = 1080. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 48 × 56 = 2688. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 328 + 849 = 1177. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 372 + 632 = 996. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 704 + 958 = 1660. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 61 × 53 = 3239. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 23 × 66 = 1523. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 184 + 130 = 314. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 16 × 77 = 1233. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 66 × 83 = 5478. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 149 + 535 = 681. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 33 × 23 = 759. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 69 × 53 = 3652. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 161 + 495 = 656. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 66 × 82 = 5415. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 869 + 622 = 1491. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 377 + 637 = 1014. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 72 × 43 = 3095. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 54 × 52 = 2808. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 52 × 27 = 1404. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 76 × 17 = 1292. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 714 + 748 = 1462. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 278 + 138 = 421. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 370 + 996 = 1362. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 68 × 16 = 1088. Correct or wrong? (a) wrong (b) correct

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