Skills Covered

How to Use This Pack

Five pages of part-part-whole stories within 20: two parts make a whole, and the question asks for the whole or for one part. Page 1 puts two parts together: 9 frogs on a log and 8 in the water. Page 2 takes a whole apart: 15 fish, 9 are orange, how many are yellow? Page 3 has a number bond beside each story; students write the whole in the top circle and the parts below, then write a number sentence. On page 4 the story gives only the whole, so students find three different ways to split it, such as 8 balloons as 2 and 6, 3 and 5, or 4 and 4. Page 5 shows a bar model for each story, with a question mark where the unknown goes. Each page starts with a worked example.

In the Classroom

Model part-part-whole with two-color counters before page 1: show 7 red and 6 yellow, push them together, and talk about the parts and the whole. On page 4, collect every way the class found for 12 toy cars and put them in order (0 and 12, 1 and 11, 2 and 10 ...) to see the pattern.

At Home

Sort a handful of things into two kinds, like spoons and forks, and ask how many in all, then how many forks if you know the total and the spoons. Draw a number bond on scrap paper together and fill it in.

Tips for Success

• The whole is the biggest number: it goes in the top circle of the number bond
• Missing the whole? Add the parts. Missing a part? Subtract or think: what plus the part makes the whole?
• On page 4, any two numbers that make the whole are right
• In a bar model, the long bar is the whole and the pieces are the parts