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9/15/10 Our Math Goal: To describe situations that involve
calculating with positive and negative integers.
Homework: p.432 Explore #1-4
1. Write a sentence using the word negative.
2. Write about two times you have seen
negative numbers.
3. If Mr. Wu has $10 in his bank account. He
buys a $20 fishing pole with his bank card.
What is his bank balance?
4. What happens when I win $5, then lose $5?
OPPOSITES
• Jeremy got 10 extra points for finishing his
project. But he got penalized 10 points for
talking.
• The spider crawled 10 inches up the water
spout. Then the rain came and washed the
spider 10 inches down.
Joe walked 3 miles north of Safeway, 3 miles
east of Safeway, 3 miles South of Safeway,
then 3 miles west of Safeway. Where is Joe
now.
Safeway
a )  1.25
b)1.25
1
c)
4
1
d) 
4
3
e)2
4
3
f )2
4
g )4.5
h)  4.5
i )75%
j )  75%
THE NUMBER LINE!
Copy the number line above, then write the
quantities onto their correct positions.
What did Cinderella say to the
photographer?
• Try this worksheet!
Individual Work:
This is a problem straight from the 2007-2008 7th
grade HSA Quarter 1 assessment:
12. Jennifer used the expression -10 + (-3) to
solve a problem. Describe a problem situation
that Jennifer could represent
with this
expression. Explain how the integers in the
expression relate to the situation.
EXIT PASS
PART A:
Answer the following with your partner:
1. What is -56 + 56 = ?
2. What is 48 + -70 = ?