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- 1.NBT.C.4Add 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.
- 1.NBT.C.5Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
- 1.NBT.C.6Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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.

Adding and Subtracting Multiples of Ten

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

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.

10 More and 10 Less

1st Grade Math

Â» Unit:

Numbers and Place Value

Big Idea:This lesson is More or Less a great lesson! Engage students in finding 10 more and 10 less than a number using these fun activities.

How Many Dots?

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

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.

Using the Number Grid to Add or Subtract Ten

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

Big Idea:The Number Grid Challenge. Students will play a game that requires them to add or subtract ten from a number using the number grid. They will record their results using standard notation.

Pick Your Ten

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

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

Base 10 Toy Box

1st Grade Math

Â» Unit:

Base 10 Bonanza

Big Idea:Are your students still counting to do 10 more? This lesson helps them explore how the numbers change when they repeatedly add 10 and why they change, helping push them towards mental math!

How Many On My Plate? (Subtraction)

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

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 subtract ten.

10 More, 10 Less

1st Grade Math

Â» Unit:

Place Value

Big Idea:My class has been learning about place value and the meaning of tens and ones. This lesson will develop knowledge of adding or subtracting ten from a 2-digit number.

End Of Unit Assessment

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

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.

10 more or less on a 120 chart

1st Grade Math

Â» Unit:

Place Value

Big Idea:Before First Graders are able to solve mentally, they must develop a concrete understanding of 10 less or 10 more than a given two-digit number. This lesson provides my students an opportunity to transition to solving mentally.

Add 10 Books

1st Grade Math

Â» Unit:

Base 10 Bonanza

Big Idea:The CCSS emphasizes that students should be able to mentally add and subtract 10, without having to count. Help students develop a conceptual understanding of repeatedly adding 10s in this lesson-this promotes mental math!

Mid Unit Check In

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

Big Idea:This task will offer a challenging activity and will also act as a piece of formative assessment as you look deeper into how well they can add or subtract ten from a number and plan your instruction from here.

How Many Dots? Day 2

1st Grade Math

Â» Unit:

The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less

Big Idea:Students will continue to explore the activities that were introduced in the previous day's lesson. The lesson will end with a discussion about subtraction equations where -10 is involved.

Beachy Base 10

1st Grade Math

Â» Unit:

Base 10 Bonanza

Big Idea:Students apply base 10 understanding to change story problems in this beachy lesson!

10 Less: An Exploration

1st Grade Math

Â» Unit:

Base 10 Bonanza

Big Idea:The CCSS asks students to mentally find 10 more and 10 less, without having to count! This lesson helps students develop a conceptual understanding of +/- 10, which will give them the foundation they need to mentally calculate 10 more/10 less!

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.

1.NBT.C.5

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

1.NBT.C.6

Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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.