Encourage students to work in
pairs to find all the possible
partitions of 10.
0 for Grace and 10 for Ana
1 for Grace and 9 for Ana
2 for Grace and 8 for Ana
3 for Grace and 7 for Ana
4 for Grace and 6 for Ana
6 for Grace and 4 for Ana
7 for Grace and 3 for Ana
8 for Grace and 2 for Ana
9 for Grace and 1 for Ana
10 for Grace and 0 for Ana
Students' methods will vary.
Organize their answers using a
table or number sentences so
they can see that Ana has all
the numbers of cookies from 0
to 10 and Grace does too.
Draw attention to the use of
the turn-around facts in
Question B, e.g., 7 + 3 = 10
and 3 + 7 = 10
AA. Sharing Cookies
Ana has 10 cookies to share with her friend Grace. If each girl
gets a fair share, how many cookies will each girl have?
List all the other ways (the "unfair" ways) Ana could share her
10 cookies.