Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 445 · 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: 24 × 15 = 358. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 767 + 742 = 1505. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 19 × 82 = 1558. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 133 + 176 = 309. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 517 + 238 = 755. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 22 × 20 = 440. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 954 + 650 = 1603. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 49 × 75 = 3679. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 63 × 75 = 4719. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 386 + 176 = 564. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 837 + 627 = 1464. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 711 + 944 = 1655. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 929 + 616 = 1544. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 29 × 33 = 956. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 556 + 808 = 1364. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 41 × 13 = 533. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 23 × 84 = 1940. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 42 × 34 = 1420. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 167 + 369 = 536. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 350 + 704 = 1051. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 17 × 46 = 776. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 178 + 202 = 376. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 49 × 49 = 2405. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 345 + 370 = 712. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 26 × 41 = 1065. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 91 × 14 = 1274. Correct or wrong? (a) wrong (b) correct
27. 27.Check with nines: 550 + 483 = 1033. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 12 × 54 = 648. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 447 + 647 = 1094. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 51 × 80 = 4080. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 895 + 587 = 1485. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 288 + 848 = 1128. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 857 + 460 = 1313. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 20 × 98 = 1960. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 83 × 18 = 1494. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 205 + 981 = 1194. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 26 × 69 = 1794. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 70 × 97 = 6790. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 94 × 95 = 8932. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 269 + 201 = 470. Correct or wrong? (a) correct (b) wrong

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