Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 275 · 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: 817 + 356 = 1173. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 65 × 38 = 2470. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 71 × 23 = 1633. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 69 × 47 = 3243. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 472 + 290 = 762. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 877 + 761 = 1646. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 48 × 82 = 3936. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 729 + 830 = 1559. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 76 × 46 = 3503. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 90 × 38 = 3420. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 18 × 99 = 1783. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 76 × 32 = 2435. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 884 + 369 = 1245. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 81 × 13 = 1052. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 563 + 359 = 924. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 40 × 95 = 3808. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 48 × 70 = 3360. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 59 × 64 = 3775. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 88 × 14 = 1226. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 526 + 772 = 1298. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 705 + 581 = 1286. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 552 + 446 = 998. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 637 + 249 = 886. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 85 × 79 = 6715. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 938 + 221 = 1159. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 17 × 88 = 1496. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 37 × 28 = 1044. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 785 + 545 = 1330. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 91 × 15 = 1361. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 44 × 36 = 1589. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 886 + 368 = 1261. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 587 + 331 = 918. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 805 + 676 = 1483. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 47 × 79 = 3707. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 51 × 67 = 3417. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 926 + 743 = 1669. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 455 + 741 = 1196. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 68 × 99 = 6729. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 770 + 309 = 1080. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 26 × 16 = 416. Correct or wrong? (a) wrong (b) correct

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