Extra Credit Problem

The problem of the week will be posted until answered. All correct 
answers will receive one extra credit point. Please e-mail answers 
to me using the e-mail icon on this website or submit your answers 
on paper*. (*Be sure your name is on your paper.)

Question:
2nd Grade: Timmy purchases 5 pencils at a cost of $.05 each.
What will his change be if he pays with a half dollar? (name the coins)
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3rd Grade: Mae's class goes on a trip. There are 7 people in a van.
Two vans go. How many people are on the trip? (Write a number
sentence and/or draw a picture to find the answer)
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4th Grade: Round the following numbers to the greatest place:
25, 123, 2567, 21578, and 6123456.