Halfway Between - Sharp EL-531RH Teachers Manual

Halfway Between

• • • • • • • • • • • • • • • • • • • • • Objective • • • • • • • • • • • • • • • • • • • • •
Understand and use fractions.
Calculate with fractions and understand the results.
• • • • • • • • • • • • • • • Explanation of the activity • • • • • • • • • • • • • •
Use the calculator to find the fraction that is exactly halfway between two other fractions.
Look for patterns to help understand how to find the answer without using the calculator.
This activity reinforces addition of common fractions and considers the result of dividing
common fractions by integers. By working on the activity, students should also develop an
increasing feel for the relative sizes of fractions.
• • • • • • • • • • • • • • • • • Using the calculator • • • • • • • • • • • • • • • • •
Calculator functions used: Addition, division, multiplication, fraction, calculation
Press the following buttons and then start operation.
Example A:
Find the fraction that is halfway between
Using fractional calculation, obtain the sum of
1
2
Half of this fraction is the number you are looking for, so
divide this fraction by 2.
2
Or after <Display 1>, multiply by .
1
Example B:
Find the fraction that is halfway between
Using fractional calculation, obtain the sum of
1
3
1
3
2
1
4
and .
and .
1 2+1 3=
ANS 2=
ANSX1 2=
and .
and .
1 3+1 4=
20
Junior high school/
Elementary school
(upper grades)
DEG
<Display 1>
DEG
DEG
DEG
<Display 2>