Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 96 · 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: 350 + 445 = 794. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 68 × 37 = 2516. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 38 × 90 = 3420. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 78 × 46 = 3588. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 38 = 2546. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 25 × 20 = 499. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 27 × 96 = 2584. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 970 + 122 = 1091. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 457 + 344 = 801. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 42 × 54 = 2271. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 598 + 708 = 1306. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 729 + 927 = 1656. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 59 × 12 = 711. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 762 + 153 = 913. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 776 + 277 = 1053. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 31 × 62 = 1916. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 85 × 29 = 2465. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 809 + 257 = 1066. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 14 × 28 = 391. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 211 + 206 = 411. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 558 + 138 = 696. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 76 × 96 = 7296. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 578 + 904 = 1476. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 571 + 887 = 1458. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 971 + 623 = 1594. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 487 + 477 = 964. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 73 × 14 = 1016. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 19 × 67 = 1273. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 414 + 721 = 1135. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 29 × 94 = 2726. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 23 × 29 = 667. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 78 × 51 = 3978. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 408 + 154 = 561. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 510 + 267 = 777. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 920 + 438 = 1358. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 76 × 80 = 6074. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 62 × 32 = 1984. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 87 × 56 = 4880. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 66 × 23 = 1518. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 494 + 722 = 1213. Correct or wrong? (a) wrong (b) correct

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