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주요 내용

STANDARDS

Math

Common Core Math

Grade 2: Number and Operations in Base Ten

2.NBT.A

Understand place value.

2.NBT.A.1

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

2.NBT.A.1.a

Mostly covered
100 can be thought of as a bundle of ten tens — called a “hundred.”

2.NBT.A.1.b

Fully covered
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

2.NBT.A.2

Partially covered
Count within 1000; skip-count by 5s, 10s, and 100s.

2.NBT.A.3

Partially covered
Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

2.NBT.A.4

Fully covered
Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.

2.NBT.B

Use place value understanding and properties of operations to add and subtract.

2.NBT.B.5

Mostly covered
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

2.NBT.B.6

Fully covered
Add up to four two-digit numbers using strategies based on place value and properties of operations.

2.NBT.B.7

Mostly covered
Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

2.NBT.B.8

Not covered
Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
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2.NBT.B.9

Fully covered
Explain why addition and subtraction strategies work, using place value and the properties of operations.