Education Technology

# Activities

• ##### Subject Area

• Math: Elementary Math: Algebraic Thinking
• Math: Elementary Math: Measurement
• Math: Elementary Math: Probability, Statistics and Data Analysis

K-5

90 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 3 from the EXPLORATIONS Book:
A World of Mathematics: Activities for Grades 4, 5, and 6 Using the TI-15

The following materials are required for this activity:
• Chart paper
• Marker
• Three 5-gallon aquariums
• Sea salt
• Warm water
• Various objects to float

## How Salty Is It?

#### Activity Overview

Students learn to solve a real-world problem involving salt water. Students will determine the amount of sea salt needed to turn an aquarium into a simulated salt-water environment. They also experiment with items and check their buoyancy in water with varying salt concentrations.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 16 - 22 from the attached PDF file for your class
• Review the four steps of problem solving with the students
• #### During the Activity

Distribute the pages to the class.

• Use the given information to create a plan
• Create a chart showing how much salt will be required to make each 5-gallon fish tank as salty as the ocean, Mono Lake, and Great Salt Lake
• Set up the three 5-gallon fish tanks with calculated amounts of salt to simulate saltiness of the ocean, Mono Lake and Great Salt Lake
• Test different items to find which items float, stay buoyant, or sink in the three tanks and record the results
• Compare the results and write an explanation for the results

• Converting volumes
• Use the calculator to solve word problems involving the interconversion of ounces to liters and gallons to liters
• #### After the Activity

• Review student results
• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary