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1.NBT.2 Resources
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Understand that the two digits of a twodigit number represent amounts of tens and ones. Understand the following as special cases:
a. 10 can be thought of as a bundle of ten ones — called a “ten.”
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones
c. 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).
Lesson Planning and Activity Resources
1.NBT.2 Marilyn Burns diagnostic interview with a student.
1.NBTInteractive games for Numbers & Operations in Base Ten
Grade 1 Unit: Understanding Place Value
(from Georgia Department of Education)
This unit addresses KCAS 1.NBT.26 and 1.MD.4.
First Grade Unit: Exploring TwoDigit Numbers
(from North Carolina Dept. of Public Instruction)
This unit addresses 1.NBT.1, 2, 3, 5 and 1.OA.6.
1.NBT.2 Lesson: Tall Towers
1.NBT.2 Lesson: Handful of Cubes
Interactive Material 
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt2a
Use the buttons to create multiples of 10.
Worksheets
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt2b
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt2c
The worksheets have:
equations that are breaking apart a two digit number into tens and ones.
writing a number based on the tens and ones.
identifying the value the place value blocks represents.
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Understand that the two digits of a twodigit number represent amounts of tens and ones. Understand the following as special cases:
a. 10 can be thought of as a bundle of ten ones — called a “ten.”
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones
c. 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).
Lesson Planning and Activity Resources
Grade 1 Unit: Understanding Place Value
(from Georgia Department of Education)
This unit addresses KCAS 1.NBT.26 and 1.MD.4.
First Grade Unit: Exploring TwoDigit Numbers
(from North Carolina Dept. of Public Instruction)
This unit addresses 1.NBT.1, 2, 3, 5 and 1.OA.6.
1.NBT.2 Lesson: Tall Towers
1.NBT.2 Lesson: Handful of Cubes
Interactive Material 
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt2a
Use the buttons to create multiples of 10.
Worksheets
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt2b
http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt2c
The worksheets have: