2.NBT.B.8

Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.

 
7 Lesson(s)
   

Hundreds, Tens, Ones Are Coins Too

2nd Grade Math » Unit: Everything In Its Place
2nd Grade Math » Unit: Everything In Its Place
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Students will extend their understanding of hundreds, tens and ones using dollars, dimes and pennies as another way to express groups of 100, 10 and 1.

 
Favorites (28)
 
Resources (11)
 
Reflections (1)
images
   

What is One Hundred More? What is One Hundred Less?

2nd Grade Math » Unit: Three-Digit Addition and Subtraction
2nd Grade Math » Unit: Three-Digit Addition and Subtraction
Caitlin Vaughan
Environment: Urban
 
Big Idea:

Students are building a foundation for using place value strategies to add and subtract within 1000.

 
Favorites (16)
 
Resources (14)
 
Reflections (1)
img 0213
   

Mentally Speaking!

2nd Grade Math » Unit: Numbers & Operation in Base Ten Grade 2
2nd Grade Math » Unit: Numbers & Operation in Base Ten Grade 2
Carol Redfield
Jackson, MS
Environment: Urban
 
Big Idea:

Using base ten blocks and place value, students explore how to become more fluent in adding and subtracting two-digit numbers without regrouping.

 
Favorites (33)
 
Resources (13)
 
Reflections (1)
mental image
   

Counting with Tens and Hundreds

2nd Grade Math » Unit: Adding and Subtracting the Basics
2nd Grade Math » Unit: Adding and Subtracting the Basics
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Being able to add and subtract with 10 and 100 is a Common Core skill expected of second grade students.

 
Favorites (3)
 
Resources (10)
 
Reflections (1)
appareilcarr
   

Is It Enough?

2nd Grade Math » Unit: Money
2nd Grade Math » Unit: Money
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Can we build a robot? How much would it cost? Do we have enough money?

 
Favorites (1)
 
Resources (12)
 
Reflections (1)
100 1290
   

Where is the Question

2nd Grade Math » Unit: Getting Better at Addition and Subtraction
2nd Grade Math » Unit: Getting Better at Addition and Subtraction
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Students can perform addition and subtraction within 100 using a variety of math tools, however, determining which operation to use is a higher level thinking skill that is being introduced in this lesson.

 
Favorites (2)
 
Resources (15)
 
Reflections (2)
100 0760
   

Smiley Face Number Friends

2nd Grade Math » Unit: Everything in Its Place
2nd Grade Math » Unit: Everything in Its Place
Beth McKenna
York, ME
Environment: Suburban
 
Big Idea:

Students will extend their understanding of partners of 10 to partners of 100.

 
Favorites (2)
 
Resources (18)
 
Reflections (1)
unknown
Common Core Math
 
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