6 + 7
Let's add six plus seven. We can use a doubles fact to help us!
We already know our doubles. Six plus six equals twelve.
Now look closely — seven is just one more than six.
So six plus seven is the same as six plus six, plus one extra.
Six plus six is twelve.
Then add one more. Twelve plus one is thirteen!
Six plus seven equals thirteen. Near-doubles makes adding easy!