Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 810 · 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: 167 + 681 = 848. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 291 + 192 = 483. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 32 × 14 = 448. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 525 + 619 = 1144. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 54 × 84 = 4542. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 161 + 359 = 520. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 88 × 16 = 1415. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 91 × 14 = 1266. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 262 + 182 = 444. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 51 × 23 = 1173. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 70 × 35 = 2449. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 44 × 32 = 1416. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 371 + 707 = 1078. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 480 + 481 = 961. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 43 × 32 = 1376. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 98 × 95 = 9317. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 600 + 410 = 1010. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 67 × 34 = 2280. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 241 + 814 = 1060. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 18 × 47 = 846. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 725 + 882 = 1607. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 30 × 78 = 2343. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 803 + 285 = 1087. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 123 + 128 = 251. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 603 + 249 = 852. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 35 × 42 = 1470. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 464 + 205 = 663. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 60 × 27 = 1620. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 544 + 637 = 1181. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 48 × 49 = 2358. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 89 × 52 = 4628. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 35 × 74 = 2586. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 173 + 210 = 383. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 23 × 77 = 1771. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 22 × 65 = 1431. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 818 + 776 = 1597. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 210 + 522 = 727. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 757 + 894 = 1656. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 868 + 156 = 1032. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 483 + 251 = 734. Correct or wrong? (a) wrong (b) correct

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