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### What Time is it in Belize?

3-5

Students will calculate differences in time zones and explore the effects of traveling across time zones.### Preparing for the Trip

3-5

In this lesson, students will use various resources to choose travel dates, compare temperatures, estimate and calculate distances to Belize City, and determine the length of their flight in preparation for a "trip" to Belize.### Getting Ready for the Dives

3-5

In this lesson, students will pretend to travel to the island of Ambergris Caye off the coast of Belize. Students will work together to complete the measurements needed for their scuba diving gear in preparation for the dives, and they will solve elapsed time problems.### Ready to Take the Plunge!

3-5

Students will work in pairs on various measurement problems. They will complete linear conversions, find elapsed time, calculate a percentage, and analyze data from a chart.### Makeshift Measurements

3-5

There are many common objects that come in standard sizes. Students
will verify measurements for some of these objects, use these objects
to determine the size or spacing of other objects, and suggest
additional objects that can be included in the class’ list of
"makeshift measures."### Comparing Heights to Explore Linear Measurement

Pre-K-2, 3-5

Students often view linear measurement as a procedure in which a number is simply read off a ruler. The goal of this lesson is to have students gain experience in linear measurement by using a variety of measuring instruments to measure the heights of classmates, to discover the error inherent in measurement, and to search for patterns in data that are represented on a table. In this lesson, students compare results of measuring the same height using different methods, and discuss measurement error. They measure the heights of classmates and the heights of older students in their school, and construct a table of height and age data. The lesson is also designed to serve as a springboard for a second lesson in which students relate measurement to algebra and data analysis concepts. ### Analyzing Changes in Height as a Function of Age

Pre-K-2, 3-5

A key goal for instruction on algebra at the elementary level is to analyze change, and to understand how change in one variable can relate to change in a second variable. The goal of this lesson is for students to explore how changes in students’ ages relate to changes in their heights. ### Factor Trail Game

3-5

When students play the Factor Trail game, they have to identify the
factors of a number to earn points. Built into this game is cooperative
learning — students check one another's work before points are awarded.
The score sheet used for this game provides a built-in assessment tool
that teachers can use to check their students' understanding.### Archimedes' Puzzle

3-5, 6-8

The *Stomachion*is an ancient tangram-type puzzle. Believed by some to have been created by Archimedes, it consists of 14 pieces cut from a square. The pieces can be rearranged to form other interesting shapes. In this lesson, students learn about the history of the

*Stomachion*, use the pieces to create other figures, learn about symmetry and transformations, and investigate the areas of the pieces.

### Number Line Journeys

3-5

In this lesson, students generate products using a number line model. Students are encouraged to predict the products and to answer puzzles involving multiplication.