Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 949 · 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: 69 × 27 = 1862. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 921 + 262 = 1179. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 76 × 16 = 1216. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 629 + 831 = 1464. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 440 + 556 = 993. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 30 × 22 = 657. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 25 × 14 = 348. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 260 + 475 = 735. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 25 × 84 = 2099. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 74 × 79 = 5854. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 84 × 61 = 5130. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 248 + 549 = 797. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 952 + 299 = 1251. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 843 + 722 = 1565. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 650 + 702 = 1352. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 485 + 815 = 1300. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 880 + 632 = 1512. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 935 + 790 = 1732. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 80 × 17 = 1360. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 249 + 208 = 457. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 17 × 89 = 1513. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 90 × 15 = 1350. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 427 + 124 = 550. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 76 × 16 = 1214. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 842 + 491 = 1341. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 652 + 545 = 1203. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 64 × 62 = 3973. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 27 × 17 = 459. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 190 + 494 = 679. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 835 + 294 = 1129. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 997 + 497 = 1487. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 16 × 88 = 1408. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 32 × 85 = 2720. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 817 + 644 = 1468. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 78 × 91 = 7093. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 87 × 32 = 2780. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 77 × 43 = 3311. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 22 × 48 = 1056. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 84 × 34 = 2861. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 59 × 28 = 1652. Correct or wrong? (a) wrong (b) correct

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