Areas Of Irregular Shapes Worksheet Page 6
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11Lessons 12, 13
17. After Macorkel Construction replaced the roof on a wrap-
around porch, the customer decided to have them replace
the floor boards as well. What is the square footage of the
porch floor plan?
32¬
8¬
24¬
24¬
16¬
8¬
$
18. Melvin needed to prime and paint the floor. Primer covers
300 square feet per gallon and paint covers 400 square feet
per gallon. What quantities of primer and paint should he
buy?
primer
Round up to the next gallon.
13
13
paint
Subtracting Negative Integers
In your early school years, you memorized the subtraction facts such as 8 – 2 = 6 and 9 – 7 = 2.
However, you subtracted only positive, not negative, numbers. How can you subtract a negative number
in a problem such as 5 – (–2) = ? The solution lies in thinking about subtraction in a different way. Look at
the following two problems:
7 – 3 = 4
7 + (–3) = 4
Both problems give us the same answer. This shows us that instead of thinking subtract when we see a
minus sign, we can think add the opposite.
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