2.NBT

Number and Operations in Base Ten

2.NBT.1Understand 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.1a100 can be thought of as a bundle of ten tens – called a “hundred.”2.NBT.1bThe numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds.2.NBT.1cShow flexibility in composing and decomposing hundreds, tens and ones (e.g. 207 can be composed from 2 hundreds 7 ones OR 20 tens 7 ones OR 207 ones OR 1 hundred 10 tens 7 ones OR 1 hundred 9 tens 17 ones, etc.)2.NBT.2Count within 1000; skip-count by 2s, 5s, 10s, and 100s; explain and generalize the patterns.2.NBT.3Read and write numbers within 1000 using base-ten numerals, number names, expanded form, and unit form.2.NBT.4Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, <, =, and ≠ relational symbols to record the results of comparisons.2.NBT.5Fluently (efficiently, accurately, and flexibly) add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction (e.g. composing/decomposing by like base-10 units, using friendly or benchmark numbers, using related equations, compensation, number line, etc.).2.NBT.6Add up to four two-digit numbers using strategies based on place value and properties of operations.2.NBT.7Add 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, like base-ten units such as hundreds and hundreds, tens and tens, ones and ones are used; and sometimes it is necessary to compose or decompose tens or hundreds.2.NBT.8Mentally add 10 or 100 to a given number 100 – 900, and mentally subtract 10 or 100 from a given number 100 – 900.2.NBT.9Explain why addition and subtraction strategies work using place value and the properties of operations. The explanations given may be supported by drawings or objects.
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