By the end of second grade children are expected to add within 20 from memory, without counting on their fingers. That fluency is what makes two-digit and three-digit addition manageable later, because every column of a longer sum is one small fact. This worksheet is only addition facts, written the same way every time, such as 7 + 6, with a line for the sum.
Facts that go past ten, like 8 + 7, are the ones children find hardest, so they appear often. Encourage a strategy instead of counting up one at a time: make ten first (8 + 2 + 5), or use a double you know (7 + 7 = 14, so 7 + 8 is one more). Do one or two together, then let your child finish the page alone and quickly.
What your child will learn
Add within 20 from memory
Make ten to add across ten
Use doubles you know to find a nearby sum
Common Core standard: 2.OA.B.2
Worked example
For 8 + 7, make ten first: 8 + 2 = 10, then add the other 5. So 8 + 7 = 15.
Common mistake
Counting up one at a time from the first number and losing track, which gives an answer that is one off.