Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 543 · 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: 235 + 174 = 409. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 23 × 93 = 2143. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 673 + 217 = 890. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 586 + 214 = 796. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 243 + 476 = 719. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 27 × 94 = 2538. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 756 + 647 = 1403. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 52 × 43 = 2236. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 13 × 46 = 598. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 319 + 765 = 1084. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 501 + 350 = 854. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 444 + 960 = 1396. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 177 + 804 = 976. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 867 + 820 = 1687. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 813 + 578 = 1385. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 166 + 261 = 427. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 588 + 157 = 752. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 62 × 94 = 5831. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 693 + 886 = 1584. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 633 + 760 = 1394. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 83 × 29 = 2400. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 241 + 464 = 713. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 922 + 127 = 1043. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 46 × 74 = 3404. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 170 + 497 = 667. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 86 × 51 = 4386. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 53 × 90 = 4770. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 16 × 21 = 336. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 887 + 560 = 1446. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 65 × 71 = 4615. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 440 + 686 = 1126. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 82 × 58 = 4750. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 671 + 349 = 1017. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 52 × 64 = 3324. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 52 × 64 = 3324. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 536 + 570 = 1108. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 74 × 78 = 5772. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 754 + 152 = 904. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 341 + 233 = 574. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 47 × 49 = 2300. Correct or wrong? (a) correct (b) wrong

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