Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 79 · 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: 340 + 325 = 668. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 37 × 75 = 2775. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 527 + 959 = 1490. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 65 × 82 = 5330. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 36 × 87 = 3132. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 43 × 73 = 3138. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 878 + 697 = 1575. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 224 + 320 = 543. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 27 × 51 = 1377. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 773 + 189 = 959. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 34 × 25 = 852. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 949 + 679 = 1628. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 690 + 158 = 848. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 80 × 62 = 4960. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 97 × 37 = 3589. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 250 + 642 = 890. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 95 × 75 = 7122. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 21 × 79 = 1655. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 67 × 60 = 4022. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 97 × 16 = 1550. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 477 + 893 = 1370. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 61 × 31 = 1891. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 38 × 57 = 2158. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 96 × 12 = 1152. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 20 × 13 = 260. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 51 × 82 = 4182. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 542 + 926 = 1474. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 91 × 91 = 8274. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 138 + 156 = 302. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 27 × 34 = 918. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 50 × 23 = 1150. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 56 × 27 = 1512. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 98 × 88 = 8624. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 34 × 12 = 411. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 35 × 63 = 2205. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 649 + 328 = 985. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 14 × 37 = 522. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 40 × 64 = 2564. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 301 + 138 = 439. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 89 × 27 = 2403. Correct or wrong? (a) correct (b) wrong

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