Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 179 · 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: 255 + 560 = 815. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 93 × 87 = 8091. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 76 × 30 = 2287. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 788 + 648 = 1436. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 546 + 487 = 1041. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 25 × 20 = 500. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 58 × 68 = 3936. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 80 × 42 = 3360. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 70 × 17 = 1190. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 631 + 686 = 1317. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 985 + 151 = 1136. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 79 × 49 = 3871. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 813 + 572 = 1385. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 391 + 737 = 1128. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 89 × 98 = 8722. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 32 × 50 = 1592. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 68 × 48 = 3256. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 991 + 240 = 1231. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 457 + 799 = 1256. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 931 + 235 = 1166. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 74 × 89 = 6586. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 24 × 42 = 1008. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 43 × 80 = 3440. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 15 × 43 = 645. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 812 + 553 = 1365. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 92 × 12 = 1104. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 34 × 52 = 1764. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 38 × 92 = 3497. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 879 + 886 = 1765. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 89 × 92 = 8188. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 99 × 49 = 4851. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 716 + 321 = 1037. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 931 + 743 = 1674. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 927 + 129 = 1056. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 15 × 44 = 660. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 224 + 877 = 1101. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 41 × 28 = 1148. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 877 + 815 = 1692. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 382 + 492 = 874. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 343 + 125 = 468. Correct or wrong? (a) wrong (b) correct

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