Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 763 · 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: 833 + 787 = 1621. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 894 + 659 = 1553. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 16 × 17 = 272. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 19 × 25 = 481. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 202 + 938 = 1143. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 25 × 47 = 1175. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 428 + 180 = 608. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 30 × 15 = 449. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 55 × 41 = 2258. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 14 × 65 = 910. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 855 + 293 = 1148. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 15 × 77 = 1163. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 970 + 534 = 1504. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 316 + 443 = 761. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 91 × 83 = 7553. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 14 × 71 = 995. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 870 + 958 = 1828. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 80 × 17 = 1365. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 20 × 92 = 1840. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 56 × 22 = 1232. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 44 × 36 = 1584. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 654 + 355 = 1002. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 659 + 449 = 1109. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 29 × 27 = 783. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 15 × 82 = 1225. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 429 + 403 = 832. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 49 × 52 = 2548. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 472 + 472 = 944. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 257 + 248 = 505. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 241 + 385 = 627. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 954 + 207 = 1166. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 65 × 19 = 1228. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 529 + 341 = 870. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 221 + 926 = 1147. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 215 + 646 = 857. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 888 + 564 = 1452. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 81 × 30 = 2430. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 91 × 97 = 8827. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 420 + 776 = 1196. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 23 × 19 = 437. Correct or wrong? (a) wrong (b) correct

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