Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Quarter 1

Quarter 2

Quarter 3

Quarter 4

Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds (without traditional algorithm).

Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds (without traditional algorithm).

Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds (without algorithm).

Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds (with algorithm).

You add two three-digit numbers together and the sum is about 500. What could the addends be? What are two other numbers that would work?

Using the digits 2, 4, 0, 1, 3, and 8 only once, make two 3-digit numbers that will result in the smallest sum. Now make two 3-digit numbers that will result in the largest difference.

Asha creates two 3-digit numbers with a difference of 284. She then creates two 3-digit numbers with a sum of 284. What could be Asha’s two number sentences? Compare your number sentences with your neighbor’s number sentences.

Two families are renting a beach house together. Because the families have a different number of children, they will each pay a different amount. Family A is paying $425 and family B is paying $475. Does it cost more than $1,000 to rent the beach house? How do you know?

Use two different strategies to solve 614 + 295 = and n 432 - 118 =

About the Math

Addition: When the parts of a set are known, addition is used to name the whole in terms of its parts.Subtraction: In a part-part whole model when the whole is known and one of the parts, subtraction names the other part. This is called the "take away" model. Subtraction can also find the difference between two whole values. To find the difference, you can count up from the smaller or down from the larger value, whichever is easier or makes sense. We sometimes overlook subtraction as the difference between two whole values and focus on the take away model. Both situations need to be part of instruction. Essential vocabulary for this standard includes: placevalue, commutativeproperty, associativeproperty, identityproperty, compose, and decompose(online dictionary, visual mathematics dictionary, HCPSS Vocabulary Cards).

The Illustrative Mathematics tasks below demonstrate expectation for this standard.

Rich Tasks for Multiple Means of Engagement, Expression, and Representation (UDL)

VDW-k-3.png

Teaching Student-Centered Mathematics, K-3

Rich Problems:
The ages of all of the members of your family total 120. In your class, are there more families whose ages total more than 120 than there are families whose ages total less than 120? (Lilburn and Ciurak, Investigations, Tasks and Rubrics to Teach and Assess Math,p 40)

Chapter 6, Strategies for Whole Number Computation, pages 157-172
Activity 6.1, Ten-Frame Adding and Subtraction, page 165
Activity 5.21, Numbers, Squares, Sticks, and Dots, page 146 Assessment note, pages 171-172 Expanded Lesson: Exploring Subtraction Strategies, pages 184-185 Activities for Flexible Thinking, pages 145-150

Number Sense, Grades 1-2 Section 3: Exploring Mental Computation,
pages 55-100 Section 5: Exploring Number Relationships,
pages 131-156

Mental Math in the Primary Grades Unit 4: Thinking Strategies for Larger Numbers,
pages 67-87

Family Math
Double Digit, page 111
Dollar Digit, page 112
Reverse Double Digit, page 113
How Close Can You Get?, page 114
Find the Digits, pages 127-133

Hands On Standards, Grade 1-2 Exploring Place Value, pages 40-41 Adding Without Regrouping, pages 44-45 Adding With Regrouping, pages 46-47 Subtracting Without Regrouping, pages 48-49 Subtracting With Regrouping, pages 50-51

Roads to Reasoning, Grade 2 What's Wrong: The Tooth Fairy, page 24 What Would You Do?: Super Snacks, page 37 What Would You Do?: Double Dessert, page 40

Elementary Math with Pizzazz!, Grade 2 Operations: Regroup, pages 20, 22, 23, 24

Hands On Standards, Grade 3-4 Adding and Subtracting, pages 20-21 Estimating the Sum or Difference, pages 22-23

## Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Quarter 1Quarter 2Quarter 3Quarter 4## Increasing Rigor

Addition: When the parts of a set are known, addition is used to name the whole in terms of its parts.Subtraction: In a part-part whole model when the whole is known and one of the parts, subtraction names the other part. This is called the "take away" model. Subtraction can also find the difference between two whole values. To find the difference, you can count up from the smaller or down from the larger value, whichever is easier or makes sense. We sometimes overlook subtraction as the difference between two whole values and focus on the take away model. Both situations need to be part of instruction. Essential vocabulary for this standard includes:About the Mathplacevalue,commutativeproperty,associativeproperty,identityproperty,compose, anddecompose(online dictionary, visual mathematics dictionary, HCPSS Vocabulary Cards).The Illustrative Mathematics tasks below demonstrate expectation for this standard.

Rich Tasks for Multiple Means of Engagement, Expression, and Representation (UDL)Teaching Student-Centered Mathematics, K-3Rich Problems:The ages of all of the members of your family total 120. In your class, are there more families whose ages total more than 120 than there are families whose ages total less than 120? (Lilburn and Ciurak, Investigations, Tasks and Rubrics to Teach and Assess Math,p 40)

Chapter 6,

Strategies for Whole Number Computation, pages 157-172Activity 6.1,

Ten-Frame Adding and Subtraction, page 165Activity 5.21,

Numbers, Squares, Sticks, and Dots, page 146Assessment note, pages 171-172Expanded Lesson: Exploring Subtraction Strategies, pages 184-185Activities for Flexible Thinking, pages 145-150## Learnzillion Video Resources (7 Lessons)

Additional Lesson Set from Learnzillion:Print ResourcesBrain Compatible Activities, Grades 2-3Sum Roll, pages 24-26Ball Toss, pages 27-30Math Hockey, pages 31-34Developing Number Concepts, Grade 2Chapter 3: Number Combinations to 20, pages 99-172Puddle Questions, Grade 2Investigation 4: Equations Galore,pages 36-43

Nimble with Numbers, Grades 2-3Addition, pages 97-118Subtraction, pages 119-144Number Sense, Grades 1-2Section 3: Exploring Mental Computation,pages 55-100

Section 5: Exploring Number Relationships,pages 131-156

Mental Math in the Primary GradesUnit 4: Thinking Strategies for Larger Numbers,pages 67-87

Family MathDouble Digit, page 111

Dollar Digit, page 112

Reverse Double Digit, page 113

How Close Can You Get?, page 114

Find the Digits, pages 127-133

Hands On Standards, Grade 1-2Exploring Place Value, pages 40-41Adding Without Regrouping, pages 44-45Adding With Regrouping, pages 46-47Subtracting Without Regrouping, pages 48-49Subtracting With Regrouping, pages 50-51Roads to Reasoning, Grade 2What's Wrong: The Tooth Fairy, page 24What Would You Do?: Super Snacks, page 37What Would You Do?: Double Dessert, page 40Elementary Math with Pizzazz!, Grade 2Operations: Regroup, pages 20, 22, 23, 24Hands On Standards, Grade 3-4Adding and Subtracting, pages 20-21Estimating the Sum or Difference, pages 22-23Read it, Draw it, Solve it, Grade 2Regrouping, pages 103, 106-112The Super Source: Base Ten Blocks, Grade K-2Race for a Flat, pages 58-61Race to Clear the Mat, pages 62-65Web ResourcesGames and CentersLessonsStudent ResourcesVideo SegmentsAdapted Mind online practice problems

DreamBox online activity

Math Playground video (great for 4th quarter)

Adapted Mind online practice problems

lesson plan

DreamBox online activity

Adapted Mind (great for 4th quarter)

Adapted Mind online practice problems

lesson plan

DreamBox online activity

(7 Lessons)

lesson seed

DreamBox online activity

Teacher guide for virtual manipulatives 2.NBT.7

Children's LiteratureMission Additionby Loreen Leedy

Subtraction Actionby Loreen Leedy

Centipede's 100 Shoesby Tony Ross

The Coin Counting Bookby Rozanne Williams

Math CurseJon Scieszka

The $1.00 Word Riddle Bookby Marilyn Burns

Pigs Will be Pigsby Amy Axelrod

Two of Everythingby Lily Toy Hong

Ten Sly Piranhasby William Wise

The Grapes of MathGreg Tang

## Questions/Comments:

Contact John SanGiovanni at jsangiovanni@hcpss.org.Use and Sharing of HCPSS Website and ResourcesHoward County Public Schools Office of Elementary Mathematics Curricular Projects has licensed this product under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.