For example: 8 + 8 = 16
If you know that equals 16 then 2 more would be 18.
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Doubles are the facts in which both addends are the same. For example 3+3=6. The doubles plus one are the facts in which one addend is larger than the other by one. Examples 3+4=7, 6+7=13, 5+6=11, 3+2=5. Learning your doubles plus one should involve knowing the doubles and mentally adding the additional one.
7 + 7+1=15
doubles doubles minus 1 count on 1
7+6
4+4