2nd Grade - Math - 2.NBT - Numbers and Operations in Base 10
Understand place value
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2.NBT.1
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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:
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2.NBT.1a
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100 can be thought of as a bundle of ten tens- called a “hundred.”
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2.NBT.1b
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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).
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2.NBT.2
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Count within 1,000; skip count by 5s, 10s and 100s.
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2.NBT.3
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Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
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2.NBT.4
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Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of the comparisons.
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Use place value understanding and properties of operations to add and subtract
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2.NBT.5
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Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
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2.NBT.6
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Add up to four two-digit numbers using strategies based on place value and properties of operations
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Notebook Files:
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2.NBT.7
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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.
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2.NBT.8
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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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Web Games
Bug Race |
Notebook Files:
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2.NBT.9
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Explain why addition and subtraction strategies work, using place value and the properties of operations.
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Web Games
Online Math |
