Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 163 · 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: 17 × 25 = 425. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 86 × 29 = 2492. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 31 × 75 = 2325. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 862 + 761 = 1623. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 506 + 326 = 832. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 788 + 755 = 1549. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 589 + 408 = 1000. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 541 + 433 = 974. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 203 + 948 = 1143. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 885 + 160 = 1052. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 84 × 68 = 5712. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 707 + 904 = 1611. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 143 + 214 = 362. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 14 × 94 = 1316. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 99 × 45 = 4455. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 881 + 822 = 1700. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 29 × 34 = 986. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 672 + 858 = 1522. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 97 × 80 = 7754. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 241 + 322 = 559. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 558 + 376 = 932. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 34 × 20 = 679. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 953 + 365 = 1315. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 329 + 477 = 806. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 221 + 793 = 1014. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 41 × 18 = 741. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 887 + 670 = 1557. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 86 × 97 = 8340. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 80 × 16 = 1286. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 84 × 88 = 7393. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 687 + 290 = 972. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 72 × 50 = 3593. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 837 + 640 = 1469. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 463 + 906 = 1369. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 748 + 382 = 1122. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 35 × 54 = 1894. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 67 × 28 = 1876. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 181 + 298 = 479. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 16 × 12 = 192. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 12 × 76 = 912. Correct or wrong? (a) correct (b) wrong

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