# MA.4.M.2.2

Solve one- and two-step addition and subtraction real-world problems involving money using decimal notation.

### Examples

Example: An item costs \$1.84. If you give the cashier \$2.00, how much change should you receive? What coins could be used to give the change?

Example: At the grocery store you spend \$14.56. If you do not want any pennies in change, how much money could you give the cashier?

General Information
Subject Area: Mathematics (B.E.S.T.)
Strand: Measurement
Status: State Board Approved

## Benchmark Instructional Guide

• NA

### Vertical Alignment

Previous Benchmarks

Next Benchmarks

### Purpose and Instructional Strategies

The purpose of this benchmark is to connect money concepts to adding and subtracting decimals. This benchmark can be taught in tandem with the addition and subtraction of decimals to the hundredths (MA.4.NSO.2.7). Students solve problems within a real-world context using money (MTR.7.1).
• For instruction, students should have opportunities using multiplication to count collections of coins (e.g., How much money is 50 nickels?).
• When students solve problems, invite flexible strategies that students learned with whole number addition and subtraction. For example, when finding the change for \$2.00 on an item that costs \$1.84, students may count up \$0.16 instead of subtracting \$2.00 - \$1.84.
• Students need to understand how different coins and bills relate to each other.

### Common Misconceptions or Errors

• Students can add and subtract incorrectly when they do not add or subtract like place values.

### Strategies to Support Tiered Instruction

• Instruction includes connecting place value to addition and subtraction of whole numbers, utilizing place value charts so that students can see where to line up values for the computation.
• For example, \$20.20 – \$9.75 is going to require some regrouping. By placing the problem in a place value chart, students can line up the decimal and subtract like place values.
• Instruction includes relating decimal place values. Working with base ten blocks, students can build decimals and their equivalents.
• For example, building 0.2 “two tenths” and 0.20 “twenty hundredths” with base ten blocks. Students will notice that the numbers have the same value.

Jordan was saving his money to buy a remote control motorcycle. He saved \$45.00 from his allowance and received two checks worth \$10.00 each for his birthday. Jordan also has a half dollar coin collection with 30 coins in it. If the motorcycle costs \$73.00, does Jordan have enough money to buy the motorcycle?

### Instructional Items

Instructional Item 1

Maria went to the comic bookstore and bought a comic book for \$5.34 and a comic book for \$9.55. If she paid with a \$20 bill, how much change would she get back?

*The strategies, tasks and items included in the B1G-M are examples and should not be considered comprehensive.

## Related Courses

This benchmark is part of these courses.
5012060: Mathematics - Grade Four (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current))
7712050: Access Mathematics Grade 4 (Specifically in versions: 2014 - 2015, 2015 - 2018, 2018 - 2022, 2022 and beyond (current))
5012065: Grade 4 Accelerated Mathematics (Specifically in versions: 2019 - 2022, 2022 and beyond (current))
5012015: Foundational Skills in Mathematics 3-5 (Specifically in versions: 2019 - 2022, 2022 and beyond (current))

## Related Access Points

Alternate version of this benchmark for students with significant cognitive disabilities.
MA.4.M.2.AP.2: Solve one- and two-step addition and subtraction real-world problems involving money using decimal notation. Sums not to exceed \$0.99 and their related subtraction facts.

## Related Resources

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

## Formative Assessment

Remote Control Motorcycle:

Students are asked to solve a multi-step word problem involving money and unit conversions.

Type: Formative Assessment

## Lesson Plans

Emergency Savings:

Students will use their multiplication skills to explore the importance of taxes and how the government uses tax revenues to save for unforeseen emergencies, in this integrated lesson plan.

Type: Lesson Plan

Volunteering with the Mayor Part 2:

Volunteering is vital to keeping any community safe, inviting, and running smoothly! In this lesson, students will work together to plan a volunteer project they would like to see happen in their community; as well as, create a budget for their project.

Type: Lesson Plan

Excavate and Relocate: Preserving the Gopher Tortoise Species:

Students will learn about a Florida keystone species, the gopher tortoise, and the steps that must be taken to safely excavate and relocate gopher tortoises found on development sites based on Florida laws.  Students will explore how citizens work with local and state government organizations, such as the Florida Fish and Wildlife Conservation Commission, to solve problems in this model eliciting activity.

Type: Lesson Plan

Volunteering with the Mayor:

The mayor wants to build a new park in town! Volunteer your time and help the mayor design an expense report with a given budget for the new park in this lesson.

Type: Lesson Plan

Making Cents of Taxes Part 2:

In this lesson plan, students will apply addition and subtraction skills with decimal values while exploring how taxes may impact citizen’s daily lives.

Type: Lesson Plan

Shopping for Groceries:

In this lesson, students will use grocery ads to take the role of a shopper and a cashier and will purchase several items. Students will be able to add and subtract decimals to hundredths, using strategies based on models, illustrations, and place value.

Type: Lesson Plan

Slither Not in the Everglades! Python MEA:

This MEA will ask students to work in teams to help their client, The Florida Fish and Wildlife Conservation Commission, to decide which Burmese python traps manufacturing company to buy traps from. The traps will be placed along the Florida Keys and the Everglades to help prevent the growth of invasive Burmese Python population. The students will implement their knowledge of how plants, animals, and humans impact the environment, use mathematical and analytical problem-solving strategies, and be able report their finding in an organized, descriptive manner.

Type: Lesson Plan

Park Planning:

Students are asked to plan a playground for a new park within a given budget and area limit. They will analyze the best use of playground equipment using a data table of area requirements and cost. Students will convert units within a single measurement system, calculate the area of a rectangle, and perform addition/subtraction calculations involving money using decimal notation.

Type: Lesson Plan

Supermarket Sweep!:

In this lesson, students will use a grocery store ad to select items for purchase, working within the constraint of making their purchases with a \$50 gift card. After their initial plan, they have some emergency expenses that change the amount of the gift card unexpectedly, and they must alter their list and re-compute how much money would remain on their gift card after their planned purchases are made.

Type: Lesson Plan

Lizard Lights:

Students will use a real-world problem solving situation to determine the best types of light bulbs to maintain an appropriate environment for a captive lizard.

Type: Lesson Plan

Fourth graders will help Cookies and Treats find cost-effective and eco-friendly packaging for its cookies. Students will organize data and compare prices using decimal notation in order to develop a procedure for choosing packaging for cookies.  Students will use multiplication and division of whole numbers to plan for how many packages to order.

Type: Lesson Plan

## Original Student Tutorial

Making Cents of Taxes:

Learn about sales tax as Malik tries to buy his favorite candy from the store in this short video.

Type: Original Student Tutorial

Money in the piggy bank:

This task is designed to help students focus on the whole that a fraction refers. It provides a context where there are two natural ways to view the coins.  While the intent is to deepen a student's understanding of fractions, it does go outside the requirements of the standard.

## Tutorial

Units of Measurement Word Problem: Making Change:

This Khan Academy tutorial video presents a strategy for computing the amount of change to be received after making a purchase.

Type: Tutorial

## STEM Lessons - Model Eliciting Activity

Fourth graders will help Cookies and Treats find cost-effective and eco-friendly packaging for its cookies. Students will organize data and compare prices using decimal notation in order to develop a procedure for choosing packaging for cookies.  Students will use multiplication and division of whole numbers to plan for how many packages to order.

Lizard Lights:

Students will use a real-world problem solving situation to determine the best types of light bulbs to maintain an appropriate environment for a captive lizard.

Park Planning:

Students are asked to plan a playground for a new park within a given budget and area limit. They will analyze the best use of playground equipment using a data table of area requirements and cost. Students will convert units within a single measurement system, calculate the area of a rectangle, and perform addition/subtraction calculations involving money using decimal notation.

Slither Not in the Everglades! Python MEA:

This MEA will ask students to work in teams to help their client, The Florida Fish and Wildlife Conservation Commission, to decide which Burmese python traps manufacturing company to buy traps from. The traps will be placed along the Florida Keys and the Everglades to help prevent the growth of invasive Burmese Python population. The students will implement their knowledge of how plants, animals, and humans impact the environment, use mathematical and analytical problem-solving strategies, and be able report their finding in an organized, descriptive manner.

## MFAS Formative Assessments

Remote Control Motorcycle:

Students are asked to solve a multi-step word problem involving money and unit conversions.

## Student Resources

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

## Original Student Tutorial

Making Cents of Taxes:

Learn about sales tax as Malik tries to buy his favorite candy from the store in this short video.

Type: Original Student Tutorial

Money in the piggy bank:

This task is designed to help students focus on the whole that a fraction refers. It provides a context where there are two natural ways to view the coins.  While the intent is to deepen a student's understanding of fractions, it does go outside the requirements of the standard.

## Tutorial

Units of Measurement Word Problem: Making Change:

This Khan Academy tutorial video presents a strategy for computing the amount of change to be received after making a purchase.

Type: Tutorial

## Parent Resources

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