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**2**

n + 4 = 7

n 5 = 4

n + 4 = 17

n 6 = 13

n + 7 = 15

n 8 = 17

3

9

13

19

8

9

Slide 15

5 + 4 = 9 4 + 5 = 9

a + b = c b + a = c

6 + 3 = 9 3 + 6 = 9

x+ y = z y + x = z

3 + 4 + 1 = 8 1 + 3 + 4 = 8

Slide 16

n + 7 = 7 + 4

m + 2 = 2 + 5

z + 3 = 3 + 9

g + 6 = 6 + 11

s + 4 = 4 + 20

c + 8 = 8 + 32

n = 4

m = 5

z = 9

g = 11

s = 20

c = 32

Slide 17

7 + 0 = 7

a + 0 = a

8 + 0 = 8

c + 0 = c

2 + 0 = 2

Slide 18

n + 0 = 8

b + 0 = 7

m + 0 = 3

v + 0 = 5

w + 0 = 4

r + 0 = 2

n = 8

b = 7

m = 3

v = 5

w = 4

r = 2

Slide 19

7 7 = 0

n n = 0

4 0 = 4

n 0 = n

Slide 20

n - 8 = 0

n 9 = 0

n 0 = 7

n 0 = 9

n 7 = 0

n 0 = 5

n = 8

n = 9

n = 7

n = 9

n = 7

n = 5

Slide 21

Timothy got 72 right on his timed test in July. He got 99 right on this same test in November.

Jasmin runs 15 minutes before school and 30 minutes after school.

One zinger costs 25 cents. Issak bought 4.

72 + n = 99 or 99 72 = n

15 + 30 = n

4 x 25 = n

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- Definitions
- An Equation is like a balance scale. Everything must be equal on both sides.
- When the amounts are equal on both sides it is a true equation.
- When an amount is unknown on one side of the equation it is an open equation.
- When you find a number for n you change the open equation to a true equation. You solve the equation.
- Are these equations true, false or open?
- How to solve an addition equation
- Solve these equations using the inverse operations
- Commutative Property
- Solve these equations using the commutative property
- The Identity Property of Addition
- Use the Identity Property of addition to solve these problems
- Subtraction Rules of zero
- Find the value of n using the rules of subtraction
- Write an equation for these problems using a variable

- Magnetic field uses sound waves to ignite sun's ring of fire
- Mechanics Lecture
- Static and Kinetic Friction
- Space Radiation
- Newtons laws of motion
- Solar Energy
- Soil and Plant Nutrition

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