Number Sense and Operations
3.oa.9. is a free educational video by sedl.It helps students in grades 3 practice the following standards 3.oa.9.
1. 3.oa.9 : Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends. .