JOURNAL #20
OCTOBER 4, 2011
TAKE OUT BOTH PARTS OF 2.2 TO CORRECT. STAPLE
THEM. YOU NEED 2 NEW PIECES OF PAPER
Subtracting integers
CHAPTER 2.3
STEPS TO SUBTRACTING INTEGERS
1.
2.
3.
4.
5.
Write down the problem
Lay down the first integer
Add zero pairs until you have what
you need
Take away the second integer
. Write your answer
REMEMBER ZERO PAIRS…..
Copy each problem.
Draw pictures to show what is happening.
Add zero pairs until you have enough to
take away what you need to.
You have to add zero
pairs until you have
enough to take away
what you need to.
You have to add zero pairs until
you have enough to take away
what you need to.
Example of
great pictures
Example of
great pictures
THERE HAS TO BE AN EASIER WAY!!!
a - (-b) = a+b
1. LEAVE
THE FIRST #ALONE
2.CHANGE FROM SUBTRACT TO ADD
3.OPPOSITE
OF THE 2ND #
Remember…only change subtract to add.
DO NOT change add to subtract.