Join+Start+Unknown

Join Start Unknown: Connie had some marbles. Juan gave her 5 more marbles. Now she has 13 marbles. How many marbles did Connie have to start with?

Modeling: 5+_____=13

media type="file" key="Modeling Strategy.mov"

Counting: 5+_____=13

media type="file" key="Counting Strategy.mov"

Fact Strategy: 5+_____=13 media type="file" key="Fact Strategy.mov"