Separate+Result+Unknown

= Separate Result Unknown =

Modeling:
Strategy: Separate From: 13 - 5 = ? media type="file" key="Movie on 2010-10-28 at 09.50.mov" width="300" height="300"

Strategy: Separate To: 13 - ? = 5 media type="file" key="Movie on 2010-10-28 at 09.51.mov" width="300" height="300"

Strategy: Join to: 5 + ? = 13 media type="file" key="Movie on 2010-10-28 at 09.52.mov" width="300" height="300"

Counting:
Most counts are kept with their fingers, counters, or tally marks. Here are ways to record their thinking. Strategy: Count Down: 13 - 5 = ? Strategy: Count Down To: 13 - ? = 5 Strategy: Count Up To: 5 + ? = 13

Derived Facts:
Strategy: Number Facts