Phase: 
During/Explore/Explain 
Activity: 
 Before the lesson, set up the "store" by placing the items for sale around the room.
 Explain that the students will be going on a shopping trip. They will be able to “purchase” five items from around the room. If they see something they would like to buy, they will write down the information for the item on their “Shopping Cart” sheet.
 Before students begin shopping, model how to fill out the shopping cart sheet so that students know what information to record. Encourage students to browse a little first before choosing an item, because they only have five slots in their shopping cart. You can also set some ground rules if you choose  you can only buy an item once, you have to buy exactly five items, you have to buy one food/drink item, etc.
 Allow students to walk around the room and shop, choosing items to buy and recording the fractional cost on their shopping cart sheet. You may want to set a timer to help keep the students focused.
 After students have finished shopping, they should return to their seat to calculate the total amount that they spent. They can shade in the squares on the bottom of their sheet to help represent the equivalence between tenths and hundredths.
 As students are working, ask them how much money each hundredsquare grid represents. How much does one square in the grid represent? How much is one row or column? (Each grid is one dollar, the squares are one cent and the rows are ten cents.)
 If time allows, figure out which student spent the most and which student spent the least.

Assessment Strategies: 
Check for accuracy with the students’ shopping totals. Observe to see if students are combining tenths and hundredths appropriately. A common misconception to look for is that adding 2/10 and 4/100 will equal 6/10 or 6/100 instead of 24/100. 

Advanced Preparation: 
 You will need to print and laminate the “Items for Sale” cards and place them around the room. (You can print the cards two pages per sheet to conserve ink. You can also use the digital version of the cards for distance learning.)
 Each student will need a copy of the “Shopping Cart” sheet.

Variation Tips (optional): 
 You can change the pictures on the cards for sale to match what your students would want to buy.
 You can let students go on a second shopping trip and buy more than five items.
 You can give students a challenge  spend as close as you can to one dollar, spend less/more than their first trip, etc.

Notes or Recommendations (optional): 
17. Express, model, and explain the equivalence between fractions with denominators of 10 and 100. a. Use fraction equivalency to add two fractions with denominators of 10 and 100. 