standard_description: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
problem_activity: Given:
$${BC=7}$$
,
$${\overleftrightarrow{AD}}$$
bisects
$${\angle BAC}$$
Find: measure of
$${BD}$$
and the measure of
$${DC}$$
[IMG]


aligns: no