Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 607 · 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: 307 + 200 = 506. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 68 × 52 = 3536. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 996 + 942 = 1938. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 43 × 89 = 3830. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 728 + 736 = 1464. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 17 × 56 = 952. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 763 + 471 = 1242. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 677 + 223 = 897. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 19 × 74 = 1406. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 347 + 445 = 798. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 342 + 667 = 1006. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 450 + 796 = 1246. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 453 + 805 = 1258. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 253 + 953 = 1202. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 141 + 435 = 576. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 54 × 48 = 2595. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 762 + 262 = 1019. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 25 × 94 = 2350. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 589 + 426 = 1015. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 82 × 21 = 1722. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 879 + 569 = 1444. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 354 + 125 = 482. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 460 + 461 = 921. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 42 × 90 = 3779. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 81 × 83 = 6723. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 924 + 747 = 1670. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 747 + 593 = 1340. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 52 × 26 = 1358. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 70 × 71 = 4970. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 165 + 482 = 643. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 273 + 871 = 1142. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 48 × 99 = 4752. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 241 + 862 = 1103. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 772 + 693 = 1465. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 62 × 55 = 3412. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 39 × 58 = 2267. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 76 × 33 = 2508. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 522 + 745 = 1267. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 378 + 153 = 529. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 54 × 52 = 2812. Correct or wrong? (a) wrong (b) correct

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