Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 897 · 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: 772 + 638 = 1403. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 473 + 512 = 991. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 786 + 854 = 1647. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 13 × 17 = 221. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 233 + 217 = 448. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 99 × 76 = 7523. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 200 + 349 = 549. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 232 + 407 = 639. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 52 × 42 = 2178. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 31 × 32 = 992. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 54 × 98 = 5292. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 72 × 81 = 5832. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 83 × 15 = 1245. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 18 × 87 = 1566. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 85 × 70 = 5950. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 33 × 45 = 1485. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 928 + 528 = 1456. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 99 × 67 = 6633. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 32 × 94 = 3008. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 62 × 81 = 5022. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 16 × 49 = 787. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 46 × 51 = 2338. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 319 + 634 = 951. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 95 × 99 = 9400. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 12 × 85 = 1020. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 74 × 32 = 2368. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 94 × 57 = 5358. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 90 × 18 = 1617. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 808 + 344 = 1152. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 17 × 33 = 565. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 997 + 916 = 1915. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 293 + 249 = 542. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 163 + 391 = 553. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 763 + 855 = 1623. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 27 × 54 = 1458. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 623 + 177 = 800. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 14 × 69 = 964. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 372 + 309 = 681. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 234 + 717 = 957. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 22 × 36 = 788. Correct or wrong? (a) correct (b) wrong

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