Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 224 · 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: 76 × 46 = 3496. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 48 × 84 = 4032. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 14 × 34 = 471. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 47 × 83 = 3909. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 768 + 732 = 1500. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 808 + 909 = 1717. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 89 × 45 = 4005. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 571 + 773 = 1344. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 61 × 50 = 3056. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 805 + 126 = 938. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 36 = 1193. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 97 × 13 = 1265. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 300 + 995 = 1294. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 838 + 188 = 1025. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 990 + 563 = 1553. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 34 × 81 = 2754. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 14 × 17 = 240. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 951 + 609 = 1552. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 644 + 819 = 1459. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 41 × 88 = 3608. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 30 × 73 = 2191. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 18 × 41 = 746. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 33 × 58 = 1918. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 798 + 615 = 1412. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 79 × 32 = 2534. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 21 × 74 = 1560. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 44 × 77 = 3380. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 434 + 237 = 667. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 858 + 668 = 1525. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 82 × 97 = 7956. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 606 + 613 = 1227. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 837 + 223 = 1060. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 51 × 60 = 3060. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 51 × 66 = 3372. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 17 × 82 = 1394. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 36 × 91 = 3281. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 519 + 614 = 1132. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 59 × 42 = 2476. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 502 + 774 = 1276. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 91 × 99 = 9010. Correct or wrong? (a) wrong (b) correct

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