5th grade math (word problems)
posted by Alex on .
I didn't see an answer from yesterday, so resending. Also, is there a website to explain how to solve word problems  like key phrases to look for (ex: 'in all'  add; 'what's left'  subtraction)?
Here's question from yesterday:
sorry,but I don't understand word problems  like what formula/expression to use. Here's the 1st problem: Rob practiced 3/5 of his music in 25minutes. About how long does it take to practice all of his music?
I know that Rob has 2/5 left of music to practice. So, do I multiply 2/5 by 25minutes?
Here's the 2nd problem: Jared vowed to walk 100miles a month. If he can walk 1/2mile in 20minutes, how many minutes will it take him to walk 100miles?
In this case, do i multiply 100 by 1/2, then multiply by 20minutes?

1: 41.66 minutes
(25*5)/3
2.: 4000 minutes
(100*20)/(0.5) 
Could you explain why you divided 25 by 3/5?

For the first question divide 3 in two 25 your answer is the equation subtracted from 25
2nd question=200×20=your answer