Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 546 · 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: 846 + 203 = 1049. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 511 + 334 = 845. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 953 + 878 = 1831. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 874 + 278 = 1152. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 568 + 845 = 1421. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 184 + 542 = 734. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 448 + 314 = 762. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 867 + 303 = 1170. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 50 × 22 = 1100. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 518 + 306 = 817. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 76 × 63 = 4788. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 67 × 38 = 2546. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 46 × 66 = 3036. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 58 × 59 = 3422. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 619 + 590 = 1209. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 60 × 33 = 1980. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 29 × 22 = 630. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 72 × 40 = 2880. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 92 × 72 = 6624. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 882 + 190 = 1067. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 948 + 385 = 1333. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 201 + 903 = 1104. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 533 + 501 = 1034. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 891 + 610 = 1501. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 97 × 32 = 3104. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 622 + 173 = 795. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 857 + 261 = 1120. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 801 + 533 = 1334. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 732 + 819 = 1559. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 562 + 152 = 714. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 959 + 663 = 1622. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 484 + 458 = 934. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 93 × 84 = 7812. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 79 × 18 = 1422. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 76 × 43 = 3268. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 500 + 192 = 695. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 212 + 977 = 1195. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 510 + 122 = 630. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 77 × 50 = 3850. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 258 + 351 = 611. Correct or wrong? (a) correct (b) wrong

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