Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 452 · 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: 530 + 667 = 1198. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 178 + 992 = 1170. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 779 + 748 = 1529. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 681 + 295 = 973. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 35 × 72 = 2517. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 794 + 739 = 1533. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 44 × 73 = 3212. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 55 × 63 = 3465. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 84 × 15 = 1256. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 38 × 76 = 2888. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 582 + 138 = 722. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 69 × 16 = 1109. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 45 × 41 = 1845. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 611 + 582 = 1198. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 304 + 220 = 524. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 965 + 903 = 1868. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 758 + 634 = 1392. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 575 + 638 = 1213. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 37 × 40 = 1480. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 33 × 28 = 931. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 195 + 215 = 407. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 196 + 397 = 593. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 50 × 19 = 950. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 817 + 508 = 1325. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 24 × 24 = 583. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 18 × 42 = 752. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 69 × 27 = 1857. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 19 × 82 = 1557. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 934 + 369 = 1302. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 366 + 797 = 1163. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 42 × 33 = 1394. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 339 + 613 = 946. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 96 × 64 = 6144. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 65 × 36 = 2348. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 333 + 358 = 693. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 23 × 27 = 621. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 48 × 99 = 4752. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 227 + 891 = 1126. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 74 × 93 = 6882. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 866 + 356 = 1222. Correct or wrong? (a) correct (b) wrong

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