continuing the conversation. cathy fosnot minilessons for multiplication and division

Continuing the Conversation

Continuing the Conversation

Cathy Fosnot

Minilessons for Multiplication and Division

A warm–up mental math string100 x 132 x 13102 x 1399 x 1314 x 99199 x 34

What strategy does this string support?

What big ideas underlie this strategy?

Pictures for early multiplication

Small Group DiscussionsWhat strategies

would you expect to see?

How would you represent them?

Count by onesSkip count2 x 6 = 4 x 3 = 6

x 22 x 9 = 2 x 3 x 3

= 6 x 3 Associative

property

How many apples? How many lemons?

How many tiles in each patio?The furniture

obscures some of the tiles possibly providing a constraint to counting by ones and supporting the development of the distributive property

The Landscape of Learning

Let’s go to a classroom…

Cdrom, minilesson folder (first), 3rd page

Video clip #53

Click icon to add picture

Did anyone try minilessons like these, with pictures? Did you find any nice pictures in magazines that you could use?

Here’s one that I found.

Grade 46 x 812 x 812 x 424 x 23 x 1618 x 50

What’s the focus of the string?

A) doubling and halving

B) associative property

C) distributive property

D) using friendly numbers

How could you show doubling and halving strategies on an array?

Let’s go to a classroom…

Cdrom, minilesson folder (first), 1st page

Video clip #16

Grade 4170 / 1734 / 17204 / 17357 / 17323 / 17

What’s the focus of the string?

A) distributive property for multiplication

B) partial quotientsC) simplifyingD) A and B

For the last problem, 323/17, if a child said I got 19 because I took 17 away from 340, how would you represent that using an open array?

17

20 -1

340-17

Let’s go to a classroom…

Cdrom, minilesson folder (second), 3rd page

Video clip #330

Has anyone tried a minilesson like this?

Any struggles with representing?

Grade 5100 / 4200 / 4200 / 8400 / 16800 / 32300 / 12900 / 18

What’s the focus of the string?

A) distributive property

B) simplifyingC) splittingD) using landmark

numbers

How does this string help with fractions?

Folder 2, page 5Clip 236

Landscape of Learning

Time for further questions…

Have fun with minilessons….