Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 683 · 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: 629 + 120 = 755. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 134 + 866 = 1000. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 294 + 955 = 1257. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 750 + 732 = 1482. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 784 + 488 = 1268. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 534 + 852 = 1386. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 755 + 124 = 879. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 79 × 25 = 1973. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 280 + 129 = 409. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 98 × 71 = 6955. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 62 × 26 = 1612. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 949 + 539 = 1486. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 685 + 141 = 821. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 276 + 400 = 669. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 59 × 19 = 1122. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 40 × 78 = 3113. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 63 × 32 = 2018. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 298 + 557 = 855. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 253 + 150 = 403. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 74 × 55 = 4070. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 56 × 25 = 1396. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 389 + 278 = 667. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 23 × 26 = 590. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 44 × 98 = 4312. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 95 × 98 = 9310. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 86 × 31 = 2666. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 49 × 77 = 3768. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 77 × 81 = 6240. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 73 × 83 = 6059. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 836 + 394 = 1231. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 86 × 93 = 7998. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 76 × 78 = 5930. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 81 × 15 = 1214. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 721 + 842 = 1563. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 662 + 277 = 939. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 50 × 85 = 4257. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 51 × 73 = 3721. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 15 × 42 = 631. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 20 × 66 = 1320. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 51 × 45 = 2299. Correct or wrong? (a) wrong (b) correct

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