Main Subject Area: Mathematics
Duration of Lesson:
- Half Dollar
- Math Games
Students will use various coin denominations to explore the concept of fractions.
- Problem Solving
- Number and Operations
Additional Subject Area Standard(s):
Students will demonstrate an understanding of the fractions 1/2($.50), 1/4($.25), 10ths ($.10) and 20ths ($.05) by using fraction circle pieces to create whole units ($1.00).
Fraction circles - whole circle, half, quarters, tenths and twentieths
On each section of the fraction circle glue a corresponding coin picture (For example, on the half fraction circle, a half dollar is glued, on the quarter circle, a quarter is glued, etc.)
Fraction and coin dice (or spinner)
Coins Used in Lesson:
Circulating U.S. half dollars, quarters, dimes and nickels
1. Students work in pairs, and each student is given a complete set of fraction circles (whole, half, quarters, and tenths, twentieths). The object of the activity is to see who can create a whole unit or $1.00 first.
2. Students place their whole circle in front of them and take turns rolling the fraction or money dice (either can be used).
3. They then place the corresponding fraction piece onto their whole piece if they can. Players should trade down equal fractions parts – 2 dimes and a nickel for a quarter, 2 quarters for a half dollar, etc.
4. The next player then rolls and repeats the process detailed above.
5. Students take turns rolling (or spinning), and the first person to create a whole unit or $1.00 wins.
Assessment / Evaluation:
Through observation, a teacher can see which student pairs understand the fraction concepts, and which pairs are having difficulty. After everyone is comfortable with the rules and the fractions, students will be expected to finish a whole unit ($1.00), and for an extra challenge, reduce the whole unit to quarter units and tenths.
Differentiated Learning Options:
For an optional activity players start with a whole unit ($1.00) and subtract the amount that they roll. This forces them to trade in larger fractions for smaller ones (1/2 for 5/10.) This may be more appropriate for fourth graders. Student can also estimate and then check how many different combinations can make a whole unit ($1.00.)