Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 553 · 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: 35 × 49 = 1716. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 280 + 975 = 1255. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 36 × 85 = 3062. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 87 × 34 = 2958. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 153 + 584 = 729. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 287 + 368 = 649. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 96 × 24 = 2306. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 33 × 34 = 1122. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 72 × 17 = 1226. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 894 + 342 = 1244. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 98 × 98 = 9602. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 941 + 416 = 1360. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 20 × 21 = 420. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 74 × 20 = 1488. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 67 × 25 = 1680. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 96 × 32 = 3072. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 23 × 36 = 828. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 20 × 95 = 1905. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 75 × 43 = 3231. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 476 + 292 = 768. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 68 × 13 = 876. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 733 + 128 = 861. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 59 × 13 = 767. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 24 × 98 = 2358. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 55 × 60 = 3292. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 43 × 76 = 3268. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 75 × 35 = 2618. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 789 + 721 = 1510. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 358 + 285 = 646. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 59 × 25 = 1475. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 45 × 34 = 1527. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 250 + 167 = 414. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 37 × 29 = 1065. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 657 + 617 = 1278. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 36 × 33 = 1188. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 784 + 208 = 992. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 40 × 37 = 1480. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 19 × 40 = 762. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 530 + 372 = 902. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 80 × 18 = 1440. Correct or wrong? (a) wrong (b) correct

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