Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 621 · 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: 26 × 98 = 2548. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 264 + 351 = 615. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 31 × 30 = 930. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 35 × 74 = 2585. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 88 × 98 = 8624. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 98 × 62 = 6076. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 998 + 328 = 1326. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 289 + 550 = 839. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 309 + 982 = 1291. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 612 + 464 = 1076. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 837 + 995 = 1832. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 571 + 805 = 1378. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 80 × 79 = 6324. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 50 × 83 = 4150. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 94 × 81 = 7614. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 265 + 827 = 1088. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 685 + 798 = 1485. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 691 + 953 = 1639. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 236 + 546 = 785. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 34 × 97 = 3293. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 61 × 55 = 3355. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 395 + 913 = 1300. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 952 + 474 = 1418. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 78 × 61 = 4758. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 915 + 178 = 1093. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 62 × 12 = 744. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 292 + 908 = 1200. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 36 × 51 = 1836. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 45 × 60 = 2692. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 685 + 151 = 834. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 39 × 94 = 3660. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 766 + 178 = 944. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 585 + 764 = 1351. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 511 + 525 = 1039. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 321 + 269 = 590. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 93 × 17 = 1581. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 28 × 93 = 2606. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 55 × 25 = 1375. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 23 = 2154. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 87 × 43 = 3741. Correct or wrong? (a) wrong (b) correct

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