We will learn many Math strategies in the beginning of the year. These are some examples.
add
zero 3+0=3
add 1 5+1=6
add 2
7+2=9 (skip counting)
doubles 6+6=12
doubles plus 1
7+6=13 (think: 6+6=12 so one more is 13)
doubles plus 2 8+6=14 (think: 6+6=12
so two more is 14)