Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 58 · 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: 25 × 24 = 601. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 701 + 588 = 1289. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 80 × 92 = 7361. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 88 × 32 = 2816. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 33 × 80 = 2637. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 42 × 50 = 2098. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 25 × 98 = 2453. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 79 × 50 = 3950. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 897 + 646 = 1540. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 55 × 80 = 4407. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 33 × 76 = 2508. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 674 + 700 = 1372. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 91 × 64 = 5818. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 14 × 60 = 840. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 73 × 29 = 2117. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 51 × 23 = 1173. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 46 × 19 = 874. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 84 × 77 = 6468. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 19 × 23 = 437. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 75 × 32 = 2404. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 479 + 339 = 820. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 120 + 822 = 945. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 83 × 28 = 2327. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 34 × 35 = 1193. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 855 + 564 = 1419. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 33 × 42 = 1390. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 36 × 77 = 2765. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 412 + 900 = 1307. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 367 + 856 = 1223. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 58 × 81 = 4698. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 32 × 40 = 1274. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 64 × 23 = 1472. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 76 × 80 = 6083. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 74 × 78 = 5772. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 341 + 529 = 870. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 242 + 534 = 776. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 663 + 891 = 1553. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 78 × 42 = 3274. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 72 × 51 = 3670. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 32 × 94 = 3008. Correct or wrong? (a) correct (b) wrong

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