Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 444 · 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: 97 × 39 = 3783. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 33 × 20 = 662. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 28 × 54 = 1512. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 32 × 80 = 2557. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 949 + 283 = 1224. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 47 × 21 = 987. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 542 + 541 = 1083. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 833 + 657 = 1490. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 35 × 46 = 1610. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 27 × 93 = 2511. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 182 + 918 = 1100. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 506 + 509 = 1011. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 67 × 76 = 5086. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 90 × 18 = 1620. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 69 × 50 = 3450. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 323 + 783 = 1098. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 153 + 176 = 329. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 52 × 87 = 4524. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 796 + 456 = 1244. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 51 × 90 = 4590. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 202 + 866 = 1068. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 80 × 84 = 6720. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 367 + 820 = 1187. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 95 × 53 = 5041. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 750 + 215 = 973. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 99 × 90 = 8914. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 89 × 32 = 2848. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 93 × 70 = 6510. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 188 + 606 = 795. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 14 × 46 = 644. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 572 + 585 = 1157. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 918 + 713 = 1629. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 922 + 190 = 1113. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 604 + 465 = 1069. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 25 × 75 = 1868. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 14 × 39 = 546. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 746 + 962 = 1704. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 162 + 241 = 399. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 850 + 596 = 1441. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 904 + 457 = 1361. Correct or wrong? (a) correct (b) wrong

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