2.NBT.A.1
Understand that the three digits of a three-digit 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).
Tasks
Ten \$10s make \$100
One, Ten, and One Hundred More and Less
Making 124
Regrouping
Bundling and Unbundling
Largest Number Game
Three composing/decomposing problems
Party Favors
Boxes and Cartons of Pencils
Counting Stamps
Looking at Numbers Every Which Way