Common Core Math: Grade 1: Numbers in Base Ten
In first grade, students define the 1s and 10s places of two-digit numbers. Using place value, students compare two-digit numbers and add numbers up to one hundred. In particular, students gain fluency with adding and subtracting multiples of 10 and adding a one-digit number to a two-digit number. Students use concrete models and visual representations to organize their thinking.
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Determine the place value of a digit based on its position in a number.
Describe the place values of a number (CCSS.Math.Content.1.NBT.B.2):
Compare the magnitudes of numbers (CCSS.Math.Content.1.NBT.B.3):
Count up to 120.
Read the name of a number (CCSS.Math.Content.1.NBT.A.1):
Count between any two numbers (CCSS.Math.Content.1.NBT.A.1):
Perform addition and subtraction.