This is Gabrielle Milleza. I have been a teacher in SFUSD for eight years and I'm a first grade Math Instructional Support Teacher.
We call ourselves MISTs. I am excited to talk to you about unit
1.3 Edition Within 20
You and your students will likely start this unit in the first week of October and continue up to the end of October.
The Big idea of this unit is flexible thinking is
required for a robust understanding of addition. For example, students may think about how and when they might use different strategies.
Where the unknown can be in a situation and the many different ways
situations can be represented including with different equations. It is important that students make connections between
math they have already learned and the math they are going to learn.
In Kindergarten, students learned to add numbers up to 10 when the sum was unknown.
This unit Is
students first look at different types of addition situations and with unknowns that are not the sum.
Later this year First Grade students will examine a variety of addition
situations with the unknown in all locations, with numbers up to 20.
In second grade, students will continue to see all the varieties of addition situations with numbers up to 100.
Students start this unit by learning strategies for Adding 0, 1, & 2 .They use these
relatively simple problems to investigate the commutative property,
although they'll call it the Turnaround strategy. They are also introduced to put- together situations and equations where an addend is the unknown.
One example of how students build their bank of addition strategies is through the use of linker cubes to make doubles and doubles plus 1towers.
Students create plus 0, 1, or 2, and doubles or
doubles plus 1 problems with cards and dominoes and use ten or double ten frames,
number Lines, linker cubes or other manipulatives to solve them.
The addition of 0, 1, & 2, encourage students to count on.
This is the Level 2 method for addition, where Level 1 Is counting all and Level 3 is converting to an easier equivalent problem.
Both dominos and linker cubes are excellent tools for helping students see how the Turnaround strategy works.
When you sit down with your colleagues to preview this unit, you should do the Expert Task together.
This Is an unknown addend situation. It may be solved and represented With addition or subtraction.
You will want to anticipate how many different ways your students will represent and solve it. Think about the questions you might want
to ask to help students make connections between the representations, while still
recognizing the one unknown addend equation that reflects the situation.
All the tasks
in this unit are presented with the Three Read protocol.
Consider how you will begin the process of having students make this strategy their own.
By the end of this unit students, will have a deeper understanding of addition strategies and representations
and are on the road to seeing that the unknown isn't always at the end of an equation.
As always If You have Feedback please go to SFUSDmath.org
and click on the curriculum Feedback Button.
Have fun with this unit and thank you for all you do. We will see you again in late October
for unit 1.4 Subtraction With 20.
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