MA.2.NSO.2.4

Explore the addition of two whole numbers with sums up to 1,000. Explore the subtraction of a whole number from a whole number, each no larger than 1,000.

Examples

Example: The difference 612-17 can be found by rewriting it as 612-12-5 which is equivalent to 600-5 which is equivalent to 595.

Example: The difference 1,000-17 can be found by using a number line and making a “jump” of 10 from 1,000 to 990 and then 7 “jumps” of 1 to 983.

Clarifications

Clarification 1: Instruction includes the use of manipulatives, number lines, drawings or properties of operations or place value.

Clarification 2: Instruction focuses on composing and decomposing ones, tens and hundreds when needed.

General Information
Subject Area: Mathematics (B.E.S.T.)
Grade: 2
Strand: Number Sense and Operations
Date Adopted or Revised: 08/20
Status: State Board Approved

Related Courses

This benchmark is part of these courses.
5012040: Mathematics - Grade Two (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current))
7712030: Access Mathematics Grade 2 (Specifically in versions: 2014 - 2015, 2015 - 2018, 2018 - 2022, 2022 and beyond (current))
5012005: Foundational Skills in Mathematics K-2 (Specifically in versions: 2019 - 2022, 2022 and beyond (current))

Related Access Points

Alternate version of this benchmark for students with significant cognitive disabilities.
MA.2.NSO.2.AP.4: Explore the addition of a two-digit and a single-digit whole number with sums up to 100. Explore the subtraction of a one-digit from a two-digit whole number.

Related Resources

Vetted resources educators can use to teach the concepts and skills in this benchmark.

Formative Assessments

Explaining the Standard Algorithm for Subtraction:

Students are asked to explain each step of a subtraction problem completed by using the standard algorithm.

Type: Formative Assessment

Explaining the Standard Algorithm for Addition:

Students are asked to explain each step of an addition problem completed by using the standard algorithm.

Type: Formative Assessment

Adding Within 1,000:

Students are asked to solve an addition problem within 1,000.

Type: Formative Assessment

Subtracting within 1,000:

Students are asked to solve a subtraction problem within 1,000.

Type: Formative Assessment

Mr. Ford’s Money:

Students are asked to solve a subtraction problem involving money.

Type: Formative Assessment

Counting Up To Subtract:

Student are asked to consider why a counting strategy works to solve subtraction problems.

Type: Formative Assessment

Place Value Strategies for Addition and Subtraction:

Students explain another student's written strategy for adding and written strategy for subtracting three-digit numbers.

Type: Formative Assessment

Lesson Plan

Cookie Contest:

This MEA asks students to decide which factors are important in choosing the best cookie in a cookie contest. Students will take on the role of cookie critics to provide feedback to a teacher whose grade level is deciding which cookie to use for a fundraiser. They will rank order their choices from the best to worst cookie. Students will provide a detailed written explanation for how they decided to rank factors and their solution. They will show their work while adding up to 4 two-digit numbers to calculate the total number of votes.

Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom.

Type: Lesson Plan

STEM Lessons - Model Eliciting Activity

Cookie Contest:

This MEA asks students to decide which factors are important in choosing the best cookie in a cookie contest. Students will take on the role of cookie critics to provide feedback to a teacher whose grade level is deciding which cookie to use for a fundraiser. They will rank order their choices from the best to worst cookie. Students will provide a detailed written explanation for how they decided to rank factors and their solution. They will show their work while adding up to 4 two-digit numbers to calculate the total number of votes.

Model Eliciting Activities, MEAs, are open-ended, interdisciplinary problem-solving activities that are meant to reveal students’ thinking about the concepts embedded in realistic situations. Click here to learn more about MEAs and how they can transform your classroom.

MFAS Formative Assessments

Adding Within 1,000:

Students are asked to solve an addition problem within 1,000.

Counting Up To Subtract:

Student are asked to consider why a counting strategy works to solve subtraction problems.

Explaining the Standard Algorithm for Addition:

Students are asked to explain each step of an addition problem completed by using the standard algorithm.

Explaining the Standard Algorithm for Subtraction:

Students are asked to explain each step of a subtraction problem completed by using the standard algorithm.

Mr. Ford’s Money:

Students are asked to solve a subtraction problem involving money.

Place Value Strategies for Addition and Subtraction:

Students explain another student's written strategy for adding and written strategy for subtracting three-digit numbers.

Subtracting within 1,000:

Students are asked to solve a subtraction problem within 1,000.

Student Resources

Vetted resources students can use to learn the concepts and skills in this benchmark.

Parent Resources

Vetted resources caregivers can use to help students learn the concepts and skills in this benchmark.