Go+Math+Chapter+4

=Lesson 4.1= media type="youtube" key="7ngiIlcxEh4" width="420" height="315"

=Lesson 4.2= media type="youtube" key="hGtlRUKdNf4" width="420" height="315"

=Lesson 4.3= media type="youtube" key="SGgZ-MIp7B0" width="420" height="315"

=Lesson 4.4= media type="youtube" key="fLmnR3Chs30" width="420" height="315"

=Lesson 4.5= media type="youtube" key="yAA302txAhI" width="420" height="315"

=Lesson 4.6= media type="youtube" key="yJsVYR9XiUQ" width="420" height="315"

=Lesson 4.7= media type="youtube" key="Mk2wds43G7w" width="420" height="315"

=Lesson 4.8= media type="youtube" key="q5-j2emtamI" width="420" height="315"