Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 667 · 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: 73 × 51 = 3717. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 25 × 18 = 445. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 24 × 86 = 2064. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 80 × 68 = 5437. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 416 + 506 = 925. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 24 = 1439. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 29 × 82 = 2378. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 139 + 816 = 955. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 38 × 65 = 2465. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 20 × 67 = 1344. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 36 × 58 = 2088. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 76 × 23 = 1747. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 783 + 589 = 1374. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 836 + 456 = 1300. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 36 × 56 = 2012. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 92 × 17 = 1564. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 16 × 20 = 321. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 39 × 39 = 1521. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 24 × 83 = 1992. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 575 + 383 = 959. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 220 + 488 = 708. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 846 + 505 = 1352. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 148 + 619 = 767. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 25 × 22 = 550. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 555 + 963 = 1518. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 305 + 951 = 1256. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 14 × 47 = 658. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 22 × 74 = 1629. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 159 + 583 = 742. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 481 + 358 = 839. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 713 + 461 = 1172. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 805 + 299 = 1096. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 51 × 44 = 2244. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 265 + 786 = 1051. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 85 × 73 = 6205. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 480 + 711 = 1191. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 91 × 29 = 2639. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 235 + 387 = 620. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 64 × 48 = 3072. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 76 × 23 = 1752. Correct or wrong? (a) correct (b) wrong

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