Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 611 · 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: 405 + 605 = 1010. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 55 × 16 = 877. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 585 + 664 = 1247. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 176 + 883 = 1059. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 698 + 694 = 1392. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 64 × 13 = 838. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 75 × 14 = 1050. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 85 × 99 = 8421. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 69 × 80 = 5524. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 87 × 25 = 2175. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 182 + 329 = 512. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 202 + 167 = 367. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 749 + 846 = 1591. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 60 × 39 = 2335. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 302 + 357 = 654. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 50 × 39 = 1950. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 52 × 92 = 4786. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 622 + 340 = 969. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 147 + 861 = 1008. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 855 + 317 = 1172. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 675 + 328 = 1009. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 125 + 195 = 325. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 152 + 216 = 376. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 896 + 811 = 1707. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 99 × 61 = 6035. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 99 × 12 = 1183. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 92 × 58 = 5336. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 133 + 525 = 650. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 235 + 496 = 731. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 97 × 70 = 6796. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 953 + 121 = 1074. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 62 × 69 = 4270. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 19 × 13 = 247. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 74 × 27 = 1998. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 30 × 98 = 2948. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 609 + 318 = 935. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 356 + 733 = 1089. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 26 × 33 = 858. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 54 × 62 = 3348. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 677 + 744 = 1424. Correct or wrong? (a) correct (b) wrong

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