Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 436 · 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: 537 + 377 = 914. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 16 × 40 = 640. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 220 + 682 = 902. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 368 + 492 = 860. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 84 × 89 = 7474. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 94 × 16 = 1511. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 509 + 412 = 921. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 359 + 322 = 680. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 991 + 198 = 1189. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 789 + 702 = 1494. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 43 × 92 = 3956. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 882 + 470 = 1352. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 96 × 83 = 7968. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 86 × 43 = 3698. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 19 × 90 = 1710. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 534 + 690 = 1223. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 329 + 691 = 1020. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 441 + 328 = 769. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 96 × 64 = 6144. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 616 + 569 = 1180. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 84 × 13 = 1092. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 22 × 55 = 1210. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 63 × 22 = 1386. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 486 + 151 = 640. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 793 + 611 = 1403. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 140 + 533 = 673. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 27 × 42 = 1137. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 41 × 21 = 858. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 47 × 34 = 1598. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 50 × 98 = 4899. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 620 + 180 = 800. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 93 × 89 = 8278. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 230 + 838 = 1068. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 49 × 75 = 3676. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 75 × 81 = 6081. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 13 × 23 = 299. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 44 × 24 = 1056. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 618 + 397 = 1015. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 267 + 255 = 529. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 400 + 454 = 857. Correct or wrong? (a) wrong (b) correct

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