math

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

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asked by larry
  1. I am still not understanding how you arrived at number 2

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  2. Find the five-number 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

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  3. Write in decimal form.94 17/ 1,000

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    posted by k
  4. 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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  5. ulzi cwfrj jmoblcux kubzt tjvhb ylinqk pzxltej

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