February 19, 2017

Homework Help: math

Posted by larry on Friday, January 5, 2007 at 2:37pm.

please check and see if my answers are correct if not let me know so i can redo these and find where i messed up

1. divid by moving the decimal point
27.3 dived 10^5

my answer .000273

2.Jon spent 1/3 of his study time doing math homework and 2/7 preparing for a history exam. What fraction of his study time remains?

my answer was 13/21

3.find the least common multiple of 10,15,25.

my answer was 150

4. Kristi jogged for 3/5 of an hour, swam for 1/2 of an hour, and rode her bicycle for 3/4 of an hour. How long did she exercise?

my answer 1 17/20

5. add 8/25+3/20

my answer 47/100

6/21 + 7/21=13/21
21/21 - 13/21=8/21
otherwise it looks ok

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