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4th Grade - Area and Perimeter Answer Key

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Area or Perimeter?
#1 If Mr. Ritchey's yard is 12 feet by 10 feet, how much fencing will he need to enclose it? Perimeter
#2 Mrs. Haber is planting a garden. If her garden is 4 feet by 13 feet, how much fertilizer will she need to cover the garden completely? Area
#3 Mrs. Buffaloe is putting up a new bulletin board. How much border will she need if the bulletin board is 11 feet long and 3 feet wide? Perimeter
#4 Mr. K is helping to put up a fence around a horse stable. If the area measures 20 feet by 31 feet, how much fencing will they need? Perimeter
#5 Mrs. Ormand is also putting up a bulletin board. How much paper will she need to cover the board if it measures 6 feet by 7 feet? Area
Missing Side
#1 The perimeter of our classroom is 120 feet. What is the length of the room if the width is 20 feet? 40 feet
#2 The area of a stamp is 6 square centimeters. What is the width of the stamp if the length is 3 cm? 2 cm
#3 A triangle's perimeter is 35 in. One side measures 5 inches. The other two sides have equivalent measure. What is the length of one of those sides? 15 in
#4 A regular pentagon has a perimeter of 50 m. What is the length of one side? 10 m
#5 Mrs. Caulder bought 50 feet of fencing to close in her garden. The length of her garden is 23 feet. If she has exactly enough fencing, what is the width of her garden? 2 feet
Misc.
#1 Mr. Ritchey just got a new puppy. He was told the puppy must have a space that is 30 square feet to run and play in. If Mr. Ritchey's yard is 5 feet wide, what length should he mark out for the puppy? 6 feet
#2 Mrs. Haber put two tables together to create a bigger area to work on. If both tables dimensions are 6 feet by 2 feet, what is the area of the new table? 24 square feet
#3 If the question uses fence, what are they asking for? Perimeter
#4 Mr. Santos is building a square sandbox for his kids. He has enough sand to cover 36 square feet. How much wood does he need to enclose the box? **Hint: Find the dimensions first, then find out the amount of wood (fence!!). 24 feet
#5 Mrs. Deese is putting tile in her bathroom. The space she needs to tile is 6 feet by 4 feet. If the tiles are 2 feet by 2 feet, how many tiles does she need? 6 tiles
Perimeter
#1 Mr. Davern has 35 feet of fencing. He wants to enclose his square garden. One side measures 12 feet long. How much more fencing does he need? 13 feet
#2 An equilateral triangle has all equal sides. What is the perimeter if one side is 11 cm? 33 cm
#3 A pool area measures 20 feet by 23 feet. How much fencing would you need to enclose it? 86 in.
#4 It is 48 feet if you walk all the way around the arcade. If the length of the arcade is 13 feet, what is the width? 11 feet
#5 Find the perimeter of the picture on the board. 46 units
Area
#1 A square has an area of 4 square cm. What is the length of one side? 2 cm
#2 A rectangular field measures 200 square feet. If one side is 20 feet, how long is the other side? 10 feet
#3 A desktop has a length of 24 and a length of 14 inches. What is the area? 336 square inches
#4 A chocolate bar has a width of 3 inches and a length of 7 inches. What would happen to the area if the length was doubled? Area is doubled
#5 A chocolate bar has a width of 3 inches and a length of 7 inches. What would happen to the area if the dimensions were doubled? Area is quadrupled
Final Question
Draw a figure that has an area of 30 square units AND a perimeter of 34 units. 15x2 Rectangle