DECIMALS: A conceptual approach
- Adding: In this lesson students learn with the help of manipulative
(place value mat) the concept of a tenth, hundredth, thousandth and
how to apply it to addition problems that involve decimals.
- Subtracting: The
lesson of adding decimals is extended in this one to subtraction
using the place value mat and the manipulative. Students learn how
to compare decimals by going from the factional representation to
the decimal one.
by a decimal: Students
learn in this lesson how to get the fractional part of a number and
then its meaning as decimal part of that same number. They extend
this understanding to multiplication of any number by a decimal.
Students solve several word problems.
- Divide by a decimal: This
lesson uses the place value mat and the manipulative to teach the
conceptual meaning of a division, and it is extended to division by
a decimal number.
- Fractions to Decimals to Percent: In this lesson students learn how to extend the concept of a
fraction represented as decimal and how it relates to the percentage
representation. Students go from a geometric representation in a
10x10 grid to the formal notation. This lesson is the introduction
for the unit dedicated to percents.