Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 908 · 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: 59 × 24 = 1416. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 768 + 251 = 1013. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 399 + 237 = 635. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 18 × 88 = 1583. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 371 + 141 = 505. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 43 × 71 = 3054. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 544 + 272 = 816. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 967 + 451 = 1412. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 939 + 151 = 1097. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 84 × 60 = 5047. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 216 + 770 = 986. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 722 + 223 = 946. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 398 + 539 = 937. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 69 × 85 = 5865. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 131 + 167 = 304. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 794 + 932 = 1728. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 43 × 41 = 1763. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 538 + 839 = 1385. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 303 + 255 = 558. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 776 + 381 = 1157. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 796 + 654 = 1450. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 682 + 589 = 1270. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 192 + 991 = 1183. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 31 × 77 = 2387. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 176 + 927 = 1100. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 487 + 267 = 754. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 95 × 26 = 2470. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 67 × 91 = 6104. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 401 + 576 = 977. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 47 × 21 = 982. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 89 × 35 = 3115. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 20 × 54 = 1081. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 933 + 217 = 1158. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 33 × 34 = 1128. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 581 + 683 = 1257. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 36 × 96 = 3456. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 73 × 23 = 1679. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 393 + 475 = 868. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 24 × 77 = 1846. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 58 × 89 = 5164. Correct or wrong? (a) wrong (b) correct

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