Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 122 · 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 × 66 = 1716. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 686 + 883 = 1569. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 80 × 68 = 5436. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 139 + 201 = 337. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 906 + 359 = 1265. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 964 + 791 = 1755. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 485 + 369 = 854. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 80 × 99 = 7920. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 184 + 307 = 491. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 840 + 160 = 1008. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 859 + 504 = 1363. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 222 + 685 = 907. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 127 + 803 = 936. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 57 × 52 = 2964. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 47 × 60 = 2820. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 70 = 2313. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 322 + 878 = 1200. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 510 + 646 = 1154. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 33 × 14 = 454. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 951 + 414 = 1366. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 231 + 876 = 1107. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 41 × 35 = 1442. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 26 = 394. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 61 × 90 = 5486. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 24 × 90 = 2163. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 443 + 776 = 1211. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 842 + 225 = 1067. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 32 × 77 = 2464. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 54 × 98 = 5292. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 966 + 562 = 1528. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 815 + 858 = 1673. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 57 × 41 = 2337. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 88 × 59 = 5195. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 913 + 207 = 1127. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 98 × 88 = 8618. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 373 + 152 = 525. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 663 + 572 = 1242. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 28 × 65 = 1817. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 185 + 935 = 1125. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 92 × 82 = 7538. Correct or wrong? (a) wrong (b) correct

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