Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 673 · 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: 74 × 91 = 6734. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 706 + 595 = 1301. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 502 + 184 = 686. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 81 × 33 = 2673. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 58 × 26 = 1502. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 32 × 31 = 992. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 18 × 32 = 576. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 799 + 669 = 1465. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 684 + 986 = 1670. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 295 + 585 = 873. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 51 × 59 = 3009. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 58 × 85 = 4933. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 526 + 241 = 771. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 75 × 37 = 2775. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 62 × 30 = 1856. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 43 × 33 = 1419. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 29 × 63 = 1827. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 25 × 41 = 1025. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 539 + 962 = 1498. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 817 + 804 = 1621. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 14 × 42 = 588. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 775 + 229 = 1004. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 163 + 194 = 357. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 644 + 680 = 1324. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 727 + 310 = 1038. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 303 + 369 = 672. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 875 + 893 = 1768. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 17 × 54 = 918. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 542 + 417 = 959. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 30 × 14 = 414. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 252 + 138 = 382. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 830 + 740 = 1572. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 778 + 430 = 1208. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 491 + 681 = 1175. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 93 × 76 = 7068. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 975 + 257 = 1232. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 29 × 95 = 2752. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 58 × 98 = 5684. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 656 + 841 = 1497. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 944 + 351 = 1303. Correct or wrong? (a) correct (b) wrong

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