Introduction to Positive and Negative Numbers

Positive and Negative Numbers

Is it positive or negative?

• Positive numbers have no sign in front

• Numbers with no signs are understood to be positive

• Negative numbers have a (-) sign in front of the number.

Open Ended

How can you tell if a number is positive or negative?

Multiple Select

Check all the numbers that are negative

• 4565

• -12

• 845

• -1253

• -88751

Numbers on the Number Line

• The left side of 0 is negative

• The right side of 0 is positive

• As number increase, they move towards the right

• As numbers decrease, they move towards the left

Open Ended

How do you know if a number is increasing or decreasing on a number line?

Which number is bigger?

• Just like with positives, negative numbers are bigger and smaller than others.

• All negative numbers are smaller than positive numbers and 0

• Negative numbers are opposite in rank than positive.

• Positive numbers get bigger as they increase 1, 2, 3

• Negative number get smaller as they go from -1, -2 , -3

Multiple Choice

Which number is largest?

• 25

• -6548

• 0

• -5

Coordinate Plane

• Negative and Positive number can be plotted on a number line AND a coordinate plane.

• A coordinate plane has a vertical number line and a horizontal number line that meet at the origin or (0,0)

Multiple Choice

-5 + 9

• 4

• -4

• 14

• -14

Multiple Choice

-3 + (-2)

• -1

• 1

• -5

• 5

Multiple Choice

-4 + (-8)

• 4

• -4

• 12

• -12

Multiple Choice

What equation is modeled?

• 7 + -6 = -6
• 7 + -13 = -6
• 7 + -14 = -6
• -6 + -14 = -6

Multiple Choice

What equation is modeled?

• 6 + -6 = -6
• -6 + 6 = 12
• 6 + -12 = -6
• -12 + 6 = -6

Multiple Choice

$$-8+\left(-5\right)=$$  

• $$-3$$  

• $$-13$$  

• $$13$$  

• 3

Multiple Choice

$$-9+\left(-12\right)+\left(-2\right)=$$  

• $$-23$$  

• $$23$$  

• $$5$$  

• $$-21$$  

Multiple Choice

When adding integers with DIFFERENT signs,

• ADD them

• SUBTRACT them

• MULTIPLY them

• DIVIDE them

Multiple Choice

When adding integers with similar signs,

• ADD the numbers

• SUBTRACT the numbers

• MULTIPLY the numbers

• DIVIDE the numbers

Multiple Choice

-2 + 4 

• -2
• 2
• 0
• -4

Multiple Choice

-8 + 20

• -28
• 28
• 14
• 12

Multiple Choice

A football team gained 9 yards on one play and then lost 22 yards on the next. Write a sum of integers to find the overall change in field position.

• -9 + (-22) = -13
• 9 + (-22) = 13
• 9 + (-22) = -13
• none

Multiple Choice

 Bob lost 5 points on page one of his math test and he lost 9 points on page two of his math test.  Which equation best describes Bob progress on his math test?

• 5 + 9 = 14

• - 5 + (-9) = - 14

• -5 + (-9) = -4

• 5 + (-9) = 4