theo wants to put a dinosaur border around the perimeter of his room. How many rolls of border must he buy if each one covers 10 ft?

What is the perimeter of his room?

theo's bedroom measures 12 3/4 ft by 9 2/3 ft.

add up each side..12 3/4 + 12 3/4 + 9 2/3 + 9 2/3=?

Then divide it by 10
Round UP to the nearest whole number

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To find out how many rolls of border Theo must buy, we need to determine the perimeter of his room.

First, we need to know the dimensions of the room. Let's assume the length of the room is L feet and the width is W feet.

The perimeter of a rectangular room is calculated by adding up all four sides. Since opposite sides of a rectangle are equal in length, the perimeter can be calculated using the formula:

Perimeter = 2L + 2W

In this case, since we need to account for all four sides of the room, and both the length and width contribute to the perimeter, the formula would be:

Perimeter = 2L + 2W + 2L + 2W
= 4L + 4W

Now that we have the formula for the perimeter, we can substitute it with the given information:

Perimeter = 4L + 4W

Let's assume the length of the room is 15 feet and the width is 12 feet.

Perimeter = (4 × 15) + (4 × 12)
= 60 + 48
= 108 feet

Therefore, the total length Theo needs to cover with the dinosaur border is 108 feet.

Since each roll of border covers 10 feet, we can now calculate the number of rolls Theo needs to buy by dividing the total length by the length covered by each roll:

Number of rolls = Total length ÷ Length covered by each roll
= 108 ÷ 10
= 10.8

Since we cannot buy fractional rolls, Theo will need to round up to the nearest whole number. Therefore, Theo needs to buy 11 rolls of border.