Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 787 · 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: 900 + 465 = 1368. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 516 + 394 = 918. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 840 + 622 = 1466. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 258 + 931 = 1196. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 370 + 488 = 854. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 85 × 91 = 7737. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 36 × 79 = 2844. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 19 × 69 = 1311. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 49 × 69 = 3381. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 34 × 34 = 1157. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 19 × 95 = 1798. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 96 × 92 = 8832. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 947 + 841 = 1786. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 34 × 90 = 3063. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 664 + 816 = 1480. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 26 × 48 = 1248. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 46 × 32 = 1465. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 160 + 284 = 444. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 43 × 61 = 2623. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 181 + 292 = 473. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 16 × 13 = 208. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 123 + 643 = 766. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 934 + 262 = 1204. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 17 × 78 = 1318. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 388 + 661 = 1045. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 386 + 489 = 875. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 41 × 20 = 820. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 802 + 167 = 969. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 22 × 32 = 700. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 53 × 85 = 4503. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 212 + 347 = 553. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 24 × 36 = 864. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 77 × 96 = 7396. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 230 + 122 = 352. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 47 × 82 = 3855. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 986 + 247 = 1233. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 93 × 55 = 5112. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 77 × 21 = 1615. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 59 × 48 = 2838. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 948 + 153 = 1098. Correct or wrong? (a) wrong (b) correct

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