February 23, 2017

Homework Help: 5th grade Math

Posted by Tim on Wednesday, September 30, 2009 at 5:04pm.

Please help me with these math problems.

#1 Matt subtracted 1.9 from 20.8 and got 1.8. Explain why this is not reasonable?

#2 Explain why it is easier to find 10 minus 1.9 mentally than with paper and pencil.

#3 On May 27, 2001, a high school student ran a mile in 3 minutes 53.43 seconds. This broke the previous U.S. record of 3 minutes 55.3 seconds set in 1965. The world record in 2001 was 3 minutes 43.13 seconds.

How much faster is:

the 2001 U.S. record than the 1965 U.S. record?

the world record than the 1965 US record?

the world record than the 2001 US record?

Please show step by step. Thanks.

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