Common Core Math: Grade 2: Numbers in Base Ten
In second grade, students extend their knowledge of place value to include the 1s, 10s and 100s places. Students compare multi-digit numbers, using inequality symbols to record the results, and count within one thousand, including counting by 5s, 10s and 100s. Students use their place value understanding to add and subtract within one thousand, including mentally adding and subtracting 10 or 100. Students represent their thinking using concrete objects, visual representations and written methods.
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Perform addition and subtraction.
Add and subtract whole numbers (CCSS.Math.Content.2.NBT.B.7):
Add several whole numbers (CCSS.Math.Content.2.NBT.B.6):
Add or subtract with 10 or 100 (CCSS.Math.Content.2.NBT.B.8):
Determine the place value of a digit based on its position in a number.