2nd Grade: Number and Operations in Base Ten (2.NBT)

2nd Grade Math 2nd Grade: Number and Operations in Base Ten (2.NBT)

Number and Operations in Base Ten (2.NBT)

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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.

Add Hundreds by One-Digit

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2.NBT.A.1a

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

2.NBT.A.1b

Understand 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

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

2.NBT.A.3

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

2.NBT.A.4

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

Compare Three-Digit Numbers

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2.NBT.B.5

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

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

2.NBT.B.7

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.