Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 104 · 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: 547 + 420 = 971. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 91 × 68 = 6192. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 329 + 973 = 1302. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 551 + 712 = 1263. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 23 × 67 = 1541. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 828 + 608 = 1436. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 644 + 429 = 1065. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 18 × 67 = 1198. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 358 + 645 = 1003. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 76 × 29 = 2196. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 68 × 50 = 3395. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 157 + 164 = 328. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 43 × 12 = 516. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 913 + 515 = 1428. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 38 × 48 = 1829. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 47 × 49 = 2303. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 39 × 63 = 2458. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 705 + 909 = 1611. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 65 × 99 = 6442. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 364 + 259 = 618. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 939 + 519 = 1458. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 309 + 989 = 1304. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 653 + 945 = 1598. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 82 × 26 = 2136. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 34 × 25 = 848. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 64 × 97 = 6214. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 746 + 957 = 1709. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 781 + 427 = 1208. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 166 + 160 = 334. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 523 + 906 = 1433. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 461 + 608 = 1069. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 53 × 63 = 3339. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 54 × 39 = 2106. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 41 × 92 = 3772. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 29 × 75 = 2175. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 66 × 89 = 5869. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 30 = 540. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 26 × 60 = 1557. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 454 + 845 = 1306. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 511 + 970 = 1481. Correct or wrong? (a) correct (b) wrong

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