Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 947 · 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: 718 + 992 = 1716. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 75 × 20 = 1500. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 44 × 62 = 2721. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 816 + 421 = 1237. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 31 × 99 = 3074. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 41 × 71 = 2911. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 22 × 66 = 1451. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 629 + 285 = 919. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 182 + 945 = 1128. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 34 × 62 = 2103. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 12 × 87 = 1040. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 980 + 725 = 1698. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 714 + 873 = 1587. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 954 + 276 = 1235. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 40 × 81 = 3240. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 59 × 51 = 3014. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 82 × 77 = 6307. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 142 + 128 = 278. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 63 × 66 = 4157. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 518 + 472 = 989. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 214 + 952 = 1165. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 16 × 27 = 430. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 828 + 617 = 1445. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 39 × 38 = 1482. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 62 × 14 = 868. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 158 + 144 = 301. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 593 + 579 = 1172. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 404 + 149 = 556. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 32 × 30 = 960. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 90 × 24 = 2160. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 21 × 98 = 2066. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 56 × 80 = 4480. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 832 + 986 = 1810. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 495 + 718 = 1213. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 37 × 23 = 851. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 448 + 291 = 739. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 222 + 406 = 629. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 47 × 26 = 1229. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 517 + 619 = 1142. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 57 × 15 = 862. Correct or wrong? (a) wrong (b) correct

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