Fractions, Decimals, Percents, Ratios:
Number Sense and Estimation

Counting Blood Cells

Sometimes doctors need to know how many of a certain kind of cell is in a drop of someone’s blood. Here’s something you can do to show you how they find this out.

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Counting Cars

Think of a way you could estimate the total number of cars that travel on the street in front of your school all day. Write down your plan and show it to your teacher.

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Mixing Colors

Use percents to create colors.

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