Yasuko Yamaguchi helps students add two numbers using an open number line. Yasuko Yamaguchi helps students add two numbers using an open number line. Let's Learn is available to stream on pbs.org ...

Teaching in Room 9. Open Number Lines 4 | 2nd Grade Math. Special | 28m 56s Video has Closed Captions | CC. Addition & subtraction strategies to solve two-digit equations using an open number line.