Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 186 · 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: 40 × 87 = 3480. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 69 × 84 = 5796. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 16 × 76 = 1216. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 589 + 264 = 847. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 81 = 5430. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 18 × 94 = 1692. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 587 + 616 = 1204. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 210 + 659 = 871. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 382 + 446 = 828. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 72 × 31 = 2232. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 753 + 382 = 1135. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 30 × 29 = 878. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 873 + 329 = 1202. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 506 + 608 = 1114. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 67 × 56 = 3751. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 896 + 602 = 1498. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 13 × 95 = 1235. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 251 + 126 = 377. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 80 × 92 = 7363. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 79 × 63 = 4977. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 577 + 609 = 1188. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 570 + 738 = 1314. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 27 × 77 = 2079. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 229 + 234 = 463. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 37 × 42 = 1554. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 94 × 38 = 3572. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 86 × 27 = 2322. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 306 + 698 = 1008. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 20 × 78 = 1560. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 32 × 89 = 2848. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 81 × 47 = 3807. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 25 × 59 = 1475. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 69 × 86 = 5934. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 86 × 33 = 2838. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 193 + 125 = 312. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 283 + 548 = 831. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 938 + 748 = 1686. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 608 + 696 = 1307. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 266 + 880 = 1142. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 46 × 73 = 3358. Correct or wrong? (a) correct (b) wrong

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