7th Grade Math Prompt One

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7th Grade Math Prompt One

• Geometry

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7th Grade Math Prompt One

• Step One Read the problem carefully
• The Radio Committee found a bookcase for the
  corner of the radio room. The base of the
  bookcase is shaped like an isosceles right
  triangle with each leg 2.5 feet in length, as
  shown below.
•  What is the area of the bookcase?
•  

2.5 feet
2.5 feet
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7th Grade Math Prompt One
Step Two Select the appropriate formula from
ISTEP Mathematics Reference Sheet
http//ideanet.doe.state.in.us/istep/pdf/42630-WEB
_MaRHandout_f02IN.pdf
The Radio Committee found a bookcase for the
corner of the radio room. The base of the
bookcase is shaped like an isosceles right
triangle with each leg 2.5 feet in length, as
shown below.
2.5 feet
2.5 feet
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7th Grade Math Prompt One
Step Three Use the formula to answer the
question.
A ½ bh
The Radio Committee found a bookcase for the
corner of the radio room. The base of the
bookcase is shaped like an isosceles right
triangle with each leg 2.5 feet in length, as
shown below.
2.5 feet
2.5 feet
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7th Grade Math Prompt One
Step Four Show your work in the box.

• Steps

• Solve

2.5 X 2.5 125 50 6.25
A ½ x 2.5 x 2.5
6.25 x .5 3.125
A ½ x 6.25
A 3.125
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7th Grade Math Prompt One
Step Five Write your answer on the line.
A ½ bh
2.5 X 2.5 125 50 6.25
A ½ x 2.5 x 2.5
6.25 x .5 3.125
A ½ x 6.25
A 3.125
Area 3.125 square feet