math
posted by larry on .
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
#2
2/7=6/21
1/3=7/21
6/21 + 7/21=13/21
21/21  13/21=8/21
otherwise it looks ok

I am still not understanding how you arrived at number 2

Find the fivenumber summary of the following set of numbers.
0.16, 0.08, 0.27, 0.20, 0.22, 0.32, 0.25, 0.18, 0.28, 0.27 
Write in decimal form.94 17/ 1,000

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?
You need to find the LCM (21) that will give you 7/21 and 6/21. "REMAINS" indicates that you will subtract so 7/21  6/21 = 1/21.
Hope that helped. 
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