Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 260 · 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: 815 + 629 = 1446. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 718 + 669 = 1389. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 129 + 633 = 756. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 738 + 657 = 1395. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 197 + 185 = 382. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 242 + 992 = 1241. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 76 × 43 = 3263. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 326 + 843 = 1170. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 82 × 28 = 2296. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 35 × 53 = 1854. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 399 + 740 = 1139. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 72 × 41 = 2957. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 76 × 60 = 4561. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 93 × 44 = 4094. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 184 + 578 = 762. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 25 × 31 = 771. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 40 × 62 = 2480. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 808 + 225 = 1025. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 94 × 82 = 7704. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 186 + 463 = 645. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 302 + 990 = 1286. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 927 + 178 = 1109. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 827 + 700 = 1527. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 63 × 66 = 4158. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 39 × 78 = 3048. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 63 × 51 = 3212. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 78 × 63 = 4914. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 514 + 388 = 905. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 654 + 422 = 1076. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 69 × 14 = 962. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 177 + 120 = 297. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 88 × 16 = 1408. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 21 × 74 = 1551. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 350 + 829 = 1179. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 262 + 917 = 1187. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 990 + 587 = 1569. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 36 × 80 = 2880. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 306 + 562 = 866. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 33 × 59 = 1947. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 317 + 863 = 1180. Correct or wrong? (a) wrong (b) correct

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