5 + -2
-8 + 5
-9 + -8
When adding two negatives the sum will be: a. always positive, b. always negative, or c. sometimes positive and sometimes negative
Prove with your counters what -7 + 9 equals
The answer to an addition problem
The answer to a subtraction problem
Numbers greater than zero
The positive number of units a number is from zero on a number line
The set of numbers that includes positive and negative numbers, and zero
10 - (-2)
-3 - 6
-4 - (-3)
What number should be subtracted from -7 to get a difference of -12?
When you subtract a negative number from a positive number the difference will be: a.) always positive, b.) always negative, c.) sometimes positive and sometimes negative?
When solving the problem -5 + 15 by walking the number line, would you be walking forward or backward?
When solving the problem -6 - 5 by walking the number line, would you be walking forward or backward?
When solving the problem -7 - (-3) by walking the number line, would you be facing the negative integers or the positive integers?
When solving the problem -9 - 4 by walking the number line, would you be facing the negative integers or the positive integers?
Explain why subtracting a negative number is the same as adding a positive by relating it to the number line.
Write an equation to represent beginning at 5 on the number line and ending at 2.
Write an equation to represent beginning at -7 on the number line and ending at -3.
Write an equation that represents beginning at 3 on the number line and ending at -1.
Write an equation to represent beginning at -6 on the number line and ending at -9.
Write an equation to represent starting at 5.25 on the number line and ending at 7.75.
3
-3
-17
B. always negative
2
Sum
Difference
Positive numbers
absolute value
Integers
12
-9
1
5
A. Always positive
Forward
Backward
Negative integers
Positive integers
When subtracting a negative number, you would be facing in the direction of the negative numbers and walking backwards, which is the same as walking forward when facing the positive integers.
5 - 3 or 5 + (-3)
-7 + 4 or -7 - (-4)
3 + (-4) or 3 - 4
-6 + (-3) or -6 - 3
5.25 + 2.5 or 5.25 - (-2.5)
