Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 890 · 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: 198 + 385 = 579. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 42 × 91 = 3822. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 547 + 900 = 1455. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 885 + 744 = 1629. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 67 × 96 = 6434. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 528 + 936 = 1464. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 25 × 37 = 926. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 17 × 21 = 359. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 556 + 237 = 793. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 38 × 74 = 2806. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 18 × 39 = 702. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 24 × 65 = 1560. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 58 × 96 = 5568. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 85 × 73 = 6205. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 364 + 207 = 569. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 94 × 56 = 5266. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 589 + 258 = 848. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 849 + 700 = 1555. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 54 × 93 = 5021. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 93 × 14 = 1302. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 36 × 25 = 900. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 73 × 85 = 6201. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 15 × 65 = 968. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 18 × 78 = 1402. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 193 + 455 = 648. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 79 × 39 = 3078. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 37 × 66 = 2447. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 51 × 14 = 714. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 93 × 30 = 2790. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 87 × 59 = 5133. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 527 + 984 = 1511. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 26 × 58 = 1508. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 24 × 12 = 288. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 550 + 725 = 1278. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 85 × 57 = 4845. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 708 + 236 = 952. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 714 + 593 = 1307. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 29 × 33 = 957. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 290 + 321 = 611. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 365 + 181 = 546. Correct or wrong? (a) wrong (b) correct

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