NY-2.NBT

Number and Operations in Base Ten

NY-2.NBT.1Understand that the digits of a three-digit number represent amounts of hundreds, tens, and ones.NY-2.NBT.2Count within 1000; skip-count by 5s, 10s, and 100s.NY-2.NBT.3Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.NY-2.NBT.4Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.NY-2.NBT.5Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.NY-2.NBT.6Add up to four two-digit numbers using strategies based on place value and properties of operations.NY-2.NBT.7aAdd 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 representation.NY-2.NBT.7bUnderstand that in adding or subtracting up to 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.NY-2.NBT.8Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.NY-2.NBT.9Explain why addition and subtraction strategies work, using place value and the properties of operations.
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