Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 236 · 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: 755 + 686 = 1441. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 891 + 174 = 1065. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 779 + 499 = 1278. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 552 + 808 = 1355. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 637 + 278 = 912. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 65 × 28 = 1820. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 65 × 69 = 4479. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 78 × 20 = 1560. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 96 × 44 = 4224. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 429 + 600 = 1029. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 83 × 36 = 2984. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 15 × 65 = 973. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 934 + 148 = 1082. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 639 + 217 = 862. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 81 × 98 = 7938. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 16 × 14 = 218. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 167 + 932 = 1099. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 953 + 770 = 1723. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 56 × 44 = 2456. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 283 + 172 = 455. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 276 + 524 = 800. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 492 + 829 = 1329. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 79 × 42 = 3311. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 47 × 85 = 3995. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 96 × 15 = 1446. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 60 × 95 = 5701. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 24 × 77 = 1852. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 72 × 23 = 1651. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 344 + 330 = 675. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 279 + 230 = 502. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 23 × 49 = 1129. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 48 × 67 = 3216. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 15 × 80 = 1198. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 709 + 193 = 902. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 73 × 29 = 2117. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 65 × 27 = 1755. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 65 × 30 = 1948. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 84 × 25 = 2093. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 336 + 674 = 1010. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 93 × 71 = 6602. Correct or wrong? (a) correct (b) wrong

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