Mathematics: Applications & Concepts, Course 2
Mathematics: Applications & Concepts, Course 2 Glencoe Online
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Group Activity Cards

Numbers
and Operations


Use groups of 2.
Materials: Grid paper, scissors, colored pencils
Puzzling Percents  

Cut out two 10 × 10 grids from grid paper.

Each partner uses the clues given below to find the pattern of shaded squares.

  • 44% of the squares are not shaded.
  • The following rows each contain 20% shaded squares: 1 and 10.
  • The following columns each contain 20% shaded squares: 1 and 10.
  • Each of rows 2, 3, and 4 have 20% more shaded squares than the previous row.
  • 80% of the squares in columns 5 and 6 are shaded.
  • 44% of the squares in rows 6, 7, 8, 9, and 10 are not shaded.
  • 28% of the squares are shaded and share a common side with four other shaded squares.
  • Each of columns 7 through 10 have 20% more unshaded squares than the previous column.
  • 12% of the squares are shaded and share a common side with two unshaded squares.

 

 
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Mathematics: Applications & Concepts, Course 2