Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 376 · 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: 269 + 492 = 761. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 62 × 67 = 4154. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 835 + 862 = 1697. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 864 + 139 = 1000. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 182 + 581 = 763. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 861 + 921 = 1778. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 68 × 90 = 6120. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 86 × 93 = 7998. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 25 × 63 = 1570. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 139 + 471 = 610. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 79 × 45 = 3555. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 162 + 290 = 452. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 66 × 21 = 1392. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 31 × 16 = 496. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 473 + 870 = 1343. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 298 + 739 = 1037. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 144 + 584 = 725. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 69 × 35 = 2419. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 99 × 79 = 7827. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 63 × 26 = 1635. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 404 + 425 = 828. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 303 + 318 = 624. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 429 + 606 = 1035. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 41 × 59 = 2420. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 792 + 349 = 1137. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 81 × 70 = 5670. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 796 + 668 = 1464. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 437 + 768 = 1205. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 37 × 30 = 1103. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 13 × 30 = 397. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 12 × 51 = 612. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 148 + 646 = 796. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 28 × 36 = 1008. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 412 + 389 = 806. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 347 + 982 = 1325. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 440 + 934 = 1374. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 93 × 71 = 6604. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 507 + 878 = 1385. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 27 × 39 = 1051. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 514 + 936 = 1444. Correct or wrong? (a) wrong (b) correct

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