Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 34 · 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: 135 + 509 = 644. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 18 × 50 = 900. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 66 × 61 = 4026. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 78 × 40 = 3116. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 506 + 337 = 846. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 89 × 29 = 2581. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 138 + 450 = 589. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 288 + 913 = 1202. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 679 + 531 = 1207. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 286 + 827 = 1121. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 21 × 52 = 1092. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 421 + 174 = 595. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 95 × 68 = 6460. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 26 × 39 = 1015. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 674 + 185 = 859. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 367 + 302 = 669. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 87 × 55 = 4781. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 31 × 69 = 2139. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 555 + 736 = 1291. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 32 × 79 = 2533. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 73 × 61 = 4458. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 18 × 15 = 270. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 86 × 46 = 3956. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 68 × 13 = 883. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 72 × 49 = 3524. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 22 × 92 = 2024. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 351 + 817 = 1166. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 739 + 555 = 1294. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 450 + 574 = 1028. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 13 × 60 = 779. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 32 × 19 = 605. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 582 + 835 = 1420. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 718 + 919 = 1637. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 302 + 457 = 753. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 73 × 89 = 6490. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 416 + 925 = 1341. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 624 + 404 = 1033. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 820 + 497 = 1317. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 68 × 20 = 1364. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 815 + 207 = 1022. Correct or wrong? (a) wrong (b) correct

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