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….