Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 708 · 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: 161 + 136 = 297. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 146 + 278 = 424. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 983 + 348 = 1339. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 85 × 57 = 4849. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 60 × 27 = 1621. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 90 × 93 = 8366. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 50 × 21 = 1050. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 67 × 81 = 5427. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 151 + 938 = 1086. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 19 × 63 = 1197. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 26 × 44 = 1144. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 70 × 90 = 6305. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 152 + 421 = 573. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 950 + 835 = 1785. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 389 + 142 = 528. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 498 + 446 = 942. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 452 + 544 = 996. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 31 × 30 = 925. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 294 + 508 = 802. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 753 + 449 = 1210. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 142 + 966 = 1111. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 793 + 620 = 1407. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 98 × 70 = 6860. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 69 × 14 = 967. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 344 + 865 = 1209. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 49 × 15 = 735. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 917 + 216 = 1133. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 427 + 877 = 1304. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 82 × 75 = 6150. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 20 × 65 = 1300. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 25 × 64 = 1600. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 82 × 15 = 1230. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 665 + 974 = 1639. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 15 × 90 = 1342. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 250 + 793 = 1043. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 840 + 321 = 1161. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 198 + 622 = 817. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 937 + 134 = 1073. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 617 + 324 = 941. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 29 × 25 = 725. Correct or wrong? (a) wrong (b) correct

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