Hands-on math!

Washington State Math Olympiad
Hints and Solutions
2012 Grade 5 Algebra
Problem

1) How many times would a piece of paper have to be folded in half to create 128 layers?

2) If three pieces of chalk are the same length as 2 Popsicle sticks, how many Popsicle sticks would be the same length as 12 pieces of chalk?

3) There were 36 heads and 104 legs in a group of horses and riders. How many riders were in the group?

Problem

4) Mr. Jackson is taking inventory of the scarves in his store. He has 1/8 as many gray scarves as brown ones. He has four times as many brown ones as yellow ones. There are 24 that are either rust or yellow. There are 10 rust-colored scarves. How many scarves does he have in his inventory?

5) The temperature has been steadily rising since 6 am. Emily records temperatures in a table as shown. What is the temperature 10 hours after 6 am?