Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 332 · 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: 380 + 332 = 706. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 38 × 14 = 532. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 130 + 954 = 1082. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 73 × 24 = 1752. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 970 + 824 = 1793. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 371 + 606 = 977. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 51 × 59 = 3006. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 80 × 49 = 3920. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 234 + 804 = 1038. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 38 × 99 = 3761. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 523 + 392 = 915. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 32 × 43 = 1373. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 22 × 78 = 1716. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 64 × 35 = 2240. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 843 + 787 = 1630. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 40 × 21 = 832. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 159 + 220 = 379. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 28 × 23 = 647. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 505 + 292 = 797. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 24 × 86 = 2064. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 60 × 51 = 3060. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 80 × 20 = 1603. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 408 + 805 = 1213. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 539 + 272 = 810. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 18 × 75 = 1350. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 393 + 258 = 644. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 370 + 156 = 526. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 941 + 764 = 1712. Correct or wrong? (a) wrong (b) correct
29. 29.Check with nines: 796 + 969 = 1763. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 13 × 21 = 273. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 14 × 22 = 302. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 82 × 17 = 1394. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 26 × 19 = 494. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 983 + 133 = 1116. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 20 × 97 = 1940. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 45 × 19 = 857. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 465 + 257 = 722. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 591 + 270 = 860. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 537 + 318 = 855. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 12 × 90 = 1080. Correct or wrong? (a) correct (b) wrong

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