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Math - Common Core Standards

First Grade

Number and Operations in Base Ten

Extend the Counting Sequence

1.NBT.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.

Ice Cream Cones Count to 120 Hundred Chart Even Hundred Chart Odd Numbers
Hundred Chart Odd and Even Count to 100 by 5s Count by 10s Count by 5

Understand Place Value

1.NBT.2. Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
  • 10 can be thought of as a bundle of ten ones — called a “ten.”
  • The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
  • The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
Place Value Place Value Place Value Groups of 10 Boats
Count Groups of 10 Apples Count 10s and 1s With Apples Groups of Tens and Ones  
1.NBT.3. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

Greater Than      
       
 

Use place value understanding and properties of operations to add and subtract

  • 1.NBT.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.
Add Groups of Ten Apples Add Tens and Ones Add 10  
       
  • 1.NBT.5. Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Add Ten      
       
  • 1.NBT.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.
Subtract Ten Subtract 20    
       

 


Math Worksheets

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