Grade 1 Math 4.5, Break apart to subtract
15:09
Grade 1 Math 4.6, Subtraction strategy, Act out with a model to solve
16:24
Grade 1 Math 4.2, Think addition to subtract
17:03
Grade 1 Math 5.8, Ways to make numbers to 20
17:37
Grade 1 Math 5.3, Identify related facts, Fact families
29:05
7.1 Simplest Form
14:16
Grade 1 Math 3.3, Add doubles (Doubles fact)
13:14
Grade 1 Math 3.6, Practice the Strategies, Count on doubles
13:12