1.NBT.C.4

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

 
22 Lesson(s)
   

It's As Basic As That

3rd Grade Math » Unit: Understanding Multiplication
3rd Grade Math » Unit: Understanding Multiplication
Michelle Marcus
Troy, MI
Environment: Suburban
 
Big Idea:

Students need to master the basic operations. The common core suggests that all four operations are mastered by the end of third grade. This lesson will help determine where to start and what to do next.

 
Favorites (13)
 
Resources (11)
 
Reflections (1)
students playing cards
   

How Many Dots?

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will engage in a variety of activities that ask them to represent numbers with groups of ten and have them counting by 10s.

 
Favorites (27)
 
Resources (29)
 
Reflections (1)
lesson image
   

Adding and Subtracting Multiples of Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will apply the idea of adding or subtracting ten to a number by adding or subtracting multiple groups of ten from a number.

 
Favorites (20)
 
Resources (22)
 
Reflections (1)
lesson image
   

Down on the Farm: Base 10 Problems

1st Grade Math » Unit: Count to 100 Every Day!
1st Grade Math » Unit: Count to 100 Every Day!
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Students have been learning about tens and ones. This day allows them to apply what they know to a "real life" farm crisis! The chickens have laid a bunch of eggs and students have to figure out how many the farmer is collecting!

 
Favorites (26)
 
Resources (19)
 
Reflections (1)
chicken
   

Sugar, Sugar!

1st Grade Math » Unit: Adding and Subtracting: Base Ten
1st Grade Math » Unit: Adding and Subtracting: Base Ten
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Students explore how they could arrange their cubes to solve story problems with numbers on the decade. This exploration pushes them to understand how arranging into tens helps them solve story problems with big numbers!

Standards:
 
Favorites (15)
 
Resources (18)
 
Reflections (1)
carlos bakery outside1
   

Use Models to Add

1st Grade Math » Unit: Two Digit Addition and Subtraction
1st Grade Math » Unit: Two Digit Addition and Subtraction
Lisa Murdock
Lakeland, FL
Environment: Urban
 
Big Idea:

In this lesson, students begin to add two digit numbers by drawing models to represent the tens and ones place.

 
Favorites (16)
 
Resources (12)
 
Reflections (1)
use models to add pic
   

Combine and Compare

1st Grade Math » Unit: Blending
1st Grade Math » Unit: Blending
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Blending is not just for ELA teachers! Today students will learn to "blend" (combine) two sets of dots and then compare the number to another using greater than by playing versions of previous learned activities.

 
Favorites (3)
 
Resources (17)
 
Reflections (1)
photo 12
   

Adding Big Numbers with Butterflies

1st Grade Math » Unit: Adding and Subtracting: Base Ten
1st Grade Math » Unit: Adding and Subtracting: Base Ten
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

How can 30+30 help you solve 30 + 31? That question drives this lesson as students make connections between number sentences.

 
Favorites (6)
 
Resources (12)
 
Reflections (1)
butterfly
   

Using a Hundreds Chart to Add

1st Grade Math » Unit: Two Digit Addition and Subtraction
1st Grade Math » Unit: Two Digit Addition and Subtraction
Lisa Murdock
Lakeland, FL
Environment: Urban
 
Big Idea:

Hundreds charts allow for children to visually follow along and see how the numbers grow as they apply the counting on strategy to greater numbers.

 
Favorites (11)
 
Resources (11)
 
Reflections (1)
using a hundred chart to add hundreds chart pic
   

Pick Your Ten

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Score this party a 10! Students will join in a 10 celebration as they choose from their favorite unit activities .

 
Favorites (2)
 
Resources (14)
 
Reflections (1)
lesson image
   

Adding Tens

1st Grade Math » Unit: Two Digit Addition and Subtraction
1st Grade Math » Unit: Two Digit Addition and Subtraction
Lisa Murdock
Lakeland, FL
Environment: Urban
 
Big Idea:

This lesson focuses on having students demonstrate how to draw a quick picture to add tens.

 
Favorites (12)
 
Resources (12)
 
Reflections (1)
lesson image 2
   

How Many On My Plate? (Addition)

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will use their ability to count by tens on and off the decade by taking part in an activity that requires them to start with a number of cubes and then repeatedly add ten.

 
Favorites (5)
 
Resources (24)
 
Reflections (1)
lesson image
   

Introduction to Money

1st Grade Math » Unit: Money!
1st Grade Math » Unit: Money!
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will take time to examine each coin, create a coin chart, and play a coin trading game.

 
Favorites (7)
 
Resources (21)
 
Reflections (1)
lesson image
   

Books and Base 10

1st Grade Math » Unit: Adding and Subtracting: Base Ten
1st Grade Math » Unit: Adding and Subtracting: Base Ten
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Head to the library and figure out how many books are stacked up! Students look back at their strategies from yesterday's lesson and revisit the best ways to solve these problems using what they know about place value!

 
Favorites (6)
 
Resources (17)
 
Reflections (1)
librarian working at the pointe coupee parish parish library in new roads louisiana in 1936
   

End Of Unit Assessment

1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
1st Grade Math » Unit: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will use the knowledge they gained during this unit to complete a variety of assessment tasks. Once they are finished, they will play a new activity.

 
Favorites (4)
 
Resources (20)
 
Reflections (1)
lesson image
Common Core Math
 
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