2.2 add integers ws day 2

Before the bell rings... Have your assignment out on your desk. Have your covered textbook with you.

l 1/3 + 2/6 + ¼ =

l Find the missing number. 2 + 19 + __ = 10

Before the bell rings... Have your assignment out on your desk. Have your covered textbook with you.

l 1/3 + 2/6 + ¼ =

l Find the missing number. 2 + 19 + __ = 10

11/12

-11

Rule: Rule: To add numbers with the same sign, To add numbers with the same sign,

ADD the numbers.ADD the numbers. KEEP THE SIGN of the numbers involved.KEEP THE SIGN of the numbers involved.

To add numbers with opposite signs To add numbers with opposite signs Subtract the numbers. Subtract the numbers. Keep the sign of the number with the Keep the sign of the number with the

larger absolute value.larger absolute value.

Day 2Day 2

Adding IntegersAdding Integers

Evaluate when Evaluate when x = - 5, y = 20, z = - 3x = - 5, y = 20, z = - 3

x + zx + z

| x| + | y || x| + | y |

| y + x | | y + x |

=

=

=

Day 2Day 2

Adding IntegersAdding Integers

Evaluate when Evaluate when x = - 5, y = 20, z = - 3x = - 5, y = 20, z = - 3

x + zx + z

| x| + | y || x| + | y |

| y + x | | y + x |

= -8

= 25

= 15

Solve using mental mathSolve using mental math

- 85 + x = - 90- 85 + x = - 90

j + -5 = -21j + -5 = -21

w + (-30) = 0w + (-30) = 0

-53 + y = -53-53 + y = -53

Solve using mental mathSolve using mental math

- 85 + x = - 90- 85 + x = - 90

j + -5 = -21j + -5 = -21

w + (-30) = 0w + (-30) = 0

-53 + y = -53-53 + y = -53

X = - 5

J = - 16

W = 30

Y = 0

Tell whether the sum of two integers is Tell whether the sum of two integers is always, sometimes or neveralways, sometimes or never negativenegative..

2.2.Two positive numbersTwo positive numbers

3.3.Two negative numbersTwo negative numbers

4.4.A positive and a negative numberA positive and a negative number

5.5.Zero and a negative numberZero and a negative number

6.6.Zero and a positive numberZero and a positive number

Tell whether the sum of two integers is Tell whether the sum of two integers is always, sometimes or neveralways, sometimes or never negativenegative..

2.2.Two positive numbersTwo positive numbers

3.3.Two negative numbersTwo negative numbers

4.4.A positive and a negative numberA positive and a negative number

5.5.Zero and a negative numberZero and a negative number

6.6.Zero and a positive numberZero and a positive number

Never

Always

Sometimes

Always

Never

You enter the elevator on the 8You enter the elevator on the 8thth floor. floor. The elevator goes up 5 floors, and then The elevator goes up 5 floors, and then goes down 7 floors, where you exit. goes down 7 floors, where you exit.

Write and evaluate and addition Write and evaluate and addition expression to find the floor on which you expression to find the floor on which you exit.exit.

You enter the elevator on the 8You enter the elevator on the 8thth floor. floor. The elevator goes up 5 floors, and then The elevator goes up 5 floors, and then goes down 7 floors, where you exit. goes down 7 floors, where you exit.

Write and evaluate and addition Write and evaluate and addition expression to find the floor on which you expression to find the floor on which you exit.exit.

8 + 5 + (-7) = 6 68 + 5 + (-7) = 6 6thth floor floor

A football team gained 5 yards on the first A football team gained 5 yards on the first play, then they lost 7 yards on the second play, then they lost 7 yards on the second play, but gained 9 yards on the third play. play, but gained 9 yards on the third play.

To get a first down, they must gain 10 To get a first down, they must gain 10 yards in 4 plays.yards in 4 plays.

How many yards must they gain on the 4How many yards must they gain on the 4thth play to get a first down?play to get a first down?

Write an addition expression and solve.Write an addition expression and solve.

A football team gained 5 yards on the first A football team gained 5 yards on the first play, then they lost 7 yards on the second play, then they lost 7 yards on the second play, but gained 9 yards on the third play. play, but gained 9 yards on the third play.

To get a first down, they must gain 10 To get a first down, they must gain 10 yards in 4 plays.yards in 4 plays.

How many yards must they gain on the 4How many yards must they gain on the 4thth play to get a first down?play to get a first down?

Write an addition expression and solve.Write an addition expression and solve. 5 + (-7) + 9 = 7 so they need 3 more yd5 + (-7) + 9 = 7 so they need 3 more yd

ParPar

What does par mean in golf?What does par mean in golf?

Do you want a low score or high score in Do you want a low score or high score in golf?golf?

AssignmentAssignment

P. 66 #24 -31, 37 – 44P. 66 #24 -31, 37 – 44

52 – 57, 6552 – 57, 65

No Calculators – show work No Calculators – show work especially on the word problems. especially on the word problems.