- CCSS.MATH.CONTENT.5.NBT.B.7
Add, subtract, multiply, and divide decimals to hundredths, 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.
Overview:
- Students will do problems involving money to add and subtract decimals with fake paper money. Students will then work on given problems with an online tool called "Money Master". While they work on this tool, they will record their math on the sheet. Those who finished early can play the games listed.
Introduction: Brainstorm with students how decimals are related to money. What is representations of the whole number, the dime, and the penny. What place value is the whole number, the dime, and the penny in?
- Give each group a Ziploc bag with fake money and have students practice making a few given amounts.
- Give a few groups a scenario in which they will need to pay for multiple things (this is for addition).
- Give some other groups a scenario in which they will need to get change back (this is for subtraction).
- Have students share out their scenario, strategy, and answers.
Technology:
Introduce "Money Master" for students to practice adding or subtracting decimals. This is an online tool where students can pick the currency of their country. They will then have to gather or subtract the given amount. While students work on this, have a record sheet to have them write down their problem. For example, students would write 0.25 + 0.05 = 0.30 for the problem below.
After they had practiced using "Money Master", they can use the sites below for more word problems practice.
Show Me the Money: http://www.beaconlearningcenter.com/WebLessons/ShowMeTheMoney/default.htm
Sources:
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