Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 99 · 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: 18 × 97 = 1743. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 77 × 23 = 1767. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 506 + 290 = 802. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 981 + 375 = 1356. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 723 + 841 = 1556. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 824 + 602 = 1426. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 50 × 14 = 707. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 999 + 711 = 1710. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 800 + 627 = 1427. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 15 × 46 = 690. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 69 × 66 = 4557. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 56 × 74 = 4144. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 18 × 80 = 1448. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 226 + 863 = 1083. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 173 + 203 = 382. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 60 × 64 = 3836. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 783 + 517 = 1300. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 929 + 631 = 1563. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 32 × 59 = 1890. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 626 + 975 = 1601. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 73 × 40 = 2920. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 440 + 215 = 661. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 69 × 47 = 3243. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 540 + 792 = 1326. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 935 + 898 = 1833. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 919 + 271 = 1190. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 55 × 31 = 1705. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 53 × 32 = 1688. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 84 × 74 = 6224. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 527 + 533 = 1060. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 380 + 258 = 638. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 278 + 954 = 1232. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 325 + 924 = 1254. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 58 × 90 = 5220. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 27 × 64 = 1728. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 78 × 71 = 5540. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 21 × 38 = 794. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 219 + 722 = 948. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 554 + 772 = 1327. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 21 × 98 = 2064. Correct or wrong? (a) wrong (b) correct

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