Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 856 · 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: 47 × 24 = 1128. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 77 × 83 = 6391. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 192 + 541 = 730. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 690 + 206 = 897. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 641 + 919 = 1560. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 240 + 284 = 524. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 775 + 258 = 1025. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 49 × 76 = 3724. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 96 × 94 = 9024. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 800 + 569 = 1364. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 980 + 558 = 1538. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 266 + 381 = 653. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 47 × 18 = 850. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 53 × 16 = 848. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 54 = 1735. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 16 × 37 = 592. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 438 + 386 = 829. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 376 + 229 = 602. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 97 × 71 = 6887. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 567 + 332 = 907. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 38 × 35 = 1330. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 85 × 76 = 6452. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 734 + 267 = 1001. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 15 × 12 = 175. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 58 × 46 = 2670. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 89 × 12 = 1071. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 67 × 17 = 1139. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 97 × 22 = 2138. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 232 + 476 = 708. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 48 × 58 = 2784. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 88 × 77 = 6772. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 49 × 62 = 3038. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 537 + 953 = 1493. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 637 + 532 = 1176. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 360 + 656 = 1016. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 449 + 802 = 1259. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 957 + 755 = 1712. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 96 × 21 = 2016. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 186 + 811 = 994. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 36 × 62 = 2229. Correct or wrong? (a) correct (b) wrong

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