Count how many pencils a girl has, then count how many pencils a boy has. Then, put all of the pencils together and count how many there are altogether
A. Combine and split groups of 6 identical objects and determine totals
B. Split a group of 6 identical objects into two groups in different ways
D. Split a group of 7 identical objects into two groups in different ways
E. Distribute and count 7 identical objects aligned in a circular arrangement
F. Distribute and count 6 identical objects aligned in two rows
G. Distribute and count 5 or 6 identical objects aligned in a column