Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 859 · 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: 673 + 593 = 1273. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 67 × 40 = 2677. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 71 × 62 = 4402. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 824 + 305 = 1122. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 58 × 29 = 1682. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 35 × 65 = 2279. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 60 × 23 = 1388. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 599 + 160 = 759. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 202 + 312 = 519. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 419 + 702 = 1119. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 241 + 908 = 1145. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 746 + 784 = 1530. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 82 × 36 = 2948. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 38 × 96 = 3656. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 98 = 3142. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 70 × 45 = 3150. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 62 × 96 = 5951. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 33 × 68 = 2240. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 77 × 39 = 3003. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 18 × 88 = 1584. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 53 × 15 = 795. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 31 × 25 = 775. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 89 × 59 = 5251. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 375 + 907 = 1274. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 970 + 792 = 1762. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 67 × 77 = 5159. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 31 = 1364. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 37 × 16 = 599. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 32 × 39 = 1256. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 596 + 834 = 1426. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 35 × 58 = 2024. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 90 × 54 = 4860. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 60 × 91 = 5457. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 709 + 269 = 978. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 632 + 933 = 1569. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 22 × 90 = 1980. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 16 × 34 = 544. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 170 + 433 = 603. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 62 × 37 = 2294. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 267 + 383 = 652. Correct or wrong? (a) correct (b) wrong

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