Common Core Mathematics K2  Cluster  Understand place value.   Grade 2   2.NBT.1.  Understand that the three digits of a threedigit 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:
a. 100 can be thought of as a bundle of ten tens −called a "hundred."
b. The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).
  2.NBT.2.  Count within 1000; skipcount by 5s, 10s, and 100s.   2.NBT.3.  Read and write numbers to 1000 using baseten numerals, number
names, and expanded form.   2.NBT.4.  Compare two threedigit numbers based on meanings of the hundreds,
tens, and ones digits, using >, =, and < symbols to record the results of
comparisons. 
