Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 768 · 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: 476 + 743 = 1219. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 45 = 4095. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 18 × 27 = 490. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 64 × 15 = 960. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 43 × 18 = 774. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 47 × 63 = 2961. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 128 + 332 = 460. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 71 × 78 = 5542. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 96 × 23 = 2211. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 300 + 369 = 669. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 873 + 243 = 1109. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 44 × 78 = 3432. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 392 + 892 = 1284. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 754 + 247 = 1005. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 37 × 61 = 2257. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 903 + 137 = 1041. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 999 + 838 = 1838. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 54 × 73 = 3942. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 954 + 586 = 1540. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 29 × 39 = 1126. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 47 × 66 = 3098. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 97 × 19 = 1844. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 39 × 68 = 2652. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 516 + 847 = 1363. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 943 + 824 = 1775. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 13 × 62 = 806. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 340 + 485 = 825. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 152 + 895 = 1051. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 662 + 297 = 959. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 757 + 523 = 1280. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 98 × 75 = 7350. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 26 × 94 = 2451. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 775 + 724 = 1499. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 12 × 63 = 756. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 55 × 87 = 4785. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 222 + 609 = 831. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 206 + 166 = 372. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 375 + 209 = 577. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 59 × 84 = 4956. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 215 + 304 = 525. Correct or wrong? (a) correct (b) wrong

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