# Video Index

### Trixie

2 years, 8 months - **Rational
Counting** - (click here)

2 years, 8 months - **Rational Counting** - (click here)

2 years, 8 months - **Modeling - Easy Addition** - Trixie is playing with her
xylophone, counting something on my T-shirt, when I see
an opportunity to introduce an Easy Addition problem. "I have 5 fish
over here, and
5 fish over here. What I want to know is how many fish I have
altogether." (click
here)

2 years, 9 months - **Rote Counting** -
(click here)

2 years, 9 months - **Rational Counting** -
(click here)

2 years, 11 months - **Modeling - Hard Subtraction 1** - Trixie is playing
with a collection of toy Sesame Street characters.
She has 5 Cookie Monsters and 3 Big Birds. She knows that she has more
Cookie
Monsters than Big Birds. Then I ask her, "how many more?" (click here)

3 years, 4 months - **Modeling - Easy Addition** - Trixie knows that her
school-age cousins get homework - worksheets with math problems.
So Trixie wants homework also. (click
here)

3 years, 4 months - **Modeling - Easy Subtraction** - Suppose that you have 5
chickens and that you give 2 of them to me.
How many chickens do you have left?
(click here)

3 years, 4 months - **Modeling - Hard Addition** - Suppose that I have 2
pennies. And suppose that you have 3 more pennies
than I have. How many pennies do you have?
(click here)

3 years, 4 months - **Modeling - Hard Subtraction 1** - I have 2 chickens and
you
have 5 chickens. How many more chickens do you have than I have?
(click here)

3 years, 4 months - **Modeling - Hard Subtraction 2** - You have 4 chickens.
You have 3 more chickens than I have.
How many chickens do I have?
(click here)

3 years, 8 months - **Modeling - Easy Multiplication** - There are 3 people,
and each person has 2 pigs.
How many pigs are there altogether? (click here)

3 years, 9 months - **Modeling - Hard Subtraction 1** - I have 2 parts of a
snake. You have 6 parts of a snake.
Who has more parts of a snake - your or me? How many more do
you have than I have? (click here)

3 years, 9 months - **Modeling - Hard Multiplication** - I have 2 parts of the
snake. You have 3 times as many parts as I have. How many parts do you
have? (click here)

### Rose

5 years, 8 months - **Modeling - Easy
Subtraction** - Suppose that you have 3 snakes and that someone gives
you some more so
that you now have a total of 7 snakes. How many snakes were you given?
(click here)

5 years, 8 months - **Shortcuts - Easy Multiplication** - There are 4 lambs,
and each lamb has 4 legs. How many legs are there altogether?
(click here)

5 years, 8 months - **Shortcuts - Hard Multiplication ** - I have 2 tigers and
Trixie has 3 times as many tigers. How many tigers does Trixie have?
(click here)

5 years, 8 months - **Modeling - Combinations (Multiplication)** - You have 2
shirts and 3 pair of pants. How many different outfits can you make?
(click here)

6 years, 7 months - **Shortcuts - Easy Addition** - There were 4 chickens and
then 3 more came. How many chickens would there be?
(click here)

6 years, 7 months - **Shortcuts - Hard Subtraction 1** - I've got 5 pennies.
You've got 3 pennies. How many
more do I have than you have.
(click here)

6 years, 7 months - **Shortcuts - Easy Multiplication** - There were 5 buses
and there were 2 chickens on each bus. How many
chickens are there altogether?
(click here)

### Eva

7 years, 8 months - **Shortcuts - Easy
Subtraction** - You had 3 candies and then Rose gave you some more.
You then had 8 candies. How many candies did Rose give you?
(click here)

7 years, 9 months - **Shortcuts - Subtraction** - How much is 51 take away 27?
How much is 63 take away 27?
(click
here)

8 years, 7 months - **Shortcuts - Easy Addition** - You have 29 gumdrops and I
have 27 gumdrops. How many gumdrops
do we have altogether? (click
here)

8 years, 7 months - **Shortcuts - Hard Addition** - I have 3 pennies and you
have 5 more pennies than I have.
How many pennies do you have?
(click here)

8 years, 7 months - **Shortcuts - Easy Subtraction** - Suppose that you had 23
snakes and 5 of them slithered
away. How many would you have left?
(click here)