Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 848 · 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: 21 × 86 = 1803. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 703 + 304 = 1008. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 893 + 766 = 1659. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 274 + 897 = 1171. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 865 + 572 = 1442. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 613 + 255 = 868. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 686 + 523 = 1205. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 186 + 771 = 957. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 374 + 909 = 1277. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 60 × 49 = 2940. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 97 × 69 = 6690. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 60 × 60 = 3600. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 51 × 46 = 2338. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 504 + 656 = 1158. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 12 × 25 = 297. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 12 × 18 = 220. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 23 × 93 = 2131. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 485 + 509 = 998. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 80 × 76 = 6080. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 120 + 235 = 355. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 88 × 34 = 2984. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 83 × 66 = 5478. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 218 + 384 = 602. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 138 + 585 = 725. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 53 × 45 = 2385. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 708 + 460 = 1165. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 47 × 63 = 2961. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 20 × 88 = 1755. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 220 + 527 = 747. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 94 × 52 = 4888. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 812 + 335 = 1147. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 374 + 981 = 1354. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 86 × 92 = 7904. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 488 + 314 = 802. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 82 × 26 = 2132. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 54 × 57 = 3078. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 83 × 71 = 5893. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 62 × 41 = 2542. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 38 × 47 = 1787. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 55 × 46 = 2526. Correct or wrong? (a) wrong (b) correct

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