Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 519 · 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: 423 + 291 = 714. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 80 × 87 = 6962. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 96 × 87 = 8352. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 491 + 398 = 896. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 785 + 616 = 1403. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 50 = 1744. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 365 + 485 = 850. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 873 + 586 = 1459. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 12 × 43 = 516. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 58 × 94 = 5452. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 311 + 356 = 667. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 73 × 57 = 4154. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 428 + 524 = 952. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 467 + 809 = 1268. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 70 × 37 = 2590. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 521 + 453 = 979. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 69 × 36 = 2483. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 746 + 670 = 1416. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 34 × 20 = 680. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 503 + 567 = 1070. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 129 + 850 = 979. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 50 × 42 = 2104. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 47 × 74 = 3480. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 349 + 880 = 1233. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 499 + 853 = 1355. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 21 × 85 = 1779. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 35 × 15 = 525. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 162 + 169 = 331. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 44 × 92 = 4043. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 15 × 58 = 865. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 615 + 170 = 793. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 28 × 97 = 2712. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 64 × 71 = 4546. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 952 + 231 = 1183. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 37 × 19 = 703. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 94 × 68 = 6392. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 217 + 749 = 965. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 497 + 644 = 1137. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 77 × 43 = 3311. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 53 × 72 = 3809. Correct or wrong? (a) correct (b) wrong

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