## Number & Operations in Base Ten

## 1.NBT.1

__CCSS.Math.Content.1.NBT.A.1__Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

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## 1.NBT.2

__CCSS.Math.Content.1.NBT.B.2__Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

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## 1.NBT.3

__CCSS.Math.Content.1.NBT.B.3__Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

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## 1.NBT.4

__CCSS.Math.Content.1.NBT.C.4__Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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 and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

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## 1.NBT.5

__CCSS.Math.Content.1.NBT.C.5__Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

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## 1.NBT.6

__CCSS.Math.Content.1.NBT.C.6__Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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 and explain the reasoning used.

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