1^{st} Grade (MAT) Targeted Standard (NBT) Number and Operations in Base Ten Cluster: Understand place value.

MAT-01.NBT.01 Demonstrate understanding that the two digits of a two-digit number represent amounts of tens and ones, including:

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 additional ones.
c. Multiples of 10 up to 90 represent a number of tens and 0 ones.