# MA.2.NSO.2.4 Export Print
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.)
Strand: Number Sense and Operations
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

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

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.

Type: Lesson Plan

## STEM Lessons - Model Eliciting Activity

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.

## MFAS Formative Assessments

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.