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Slide 1

Slide 2

Which expression represents the number of stamps Sarah has left?

Sarah collects stamps and keeps them in envelopes. She had 9 envelopes with a certain number of stamps, s, in each envelope. She sells 3 of the envelopes.

A. 9s - 3

B. (9 + 3) s

C. 9s - 3s

D. 9s - s - 3

Slide 3

Answer:

C. 9s - 3s

Slide 4

What is the area of the wall that Keesha will paint?

2. Keesha will paint one rectangular wall of her bedroom. The wall measures 10 feet by 8 feet.

A = l x w

A. 18 square feet

B. 64 square feet

C. 80 square feet

D. 100 square feet

Slide 5

Answer:

C. 80 square feet

Slide 6

What number should replace n?

If 47 - n = 29, what number should replace n to make the sentence true?

A. 12

B. 18

C. 21

D. 22

Slide 7

Answer:

B. 18

Slide 8

Write an expression for the number of hummingbirds Lewis saw on Saturday.

On Friday, Lewis saw a certain number of hummingbirds, h. On Saturday, he saw 3 more than twice the number of hummingbirds he saw on Friday. Write your answer.

Slide 9

Answer:

3 + 2h

Slide 10

Explain the difference between an expression and an equation?

Answer:

Equation has an equal sign.

- Understanding Heat Transfer, Conduction, Convection and Radiation
- Static and Kinetic Friction
- Friction
- Buoyancy
- Mechanical, Electromagnetic, Electrical, Chemical and Thermal
- Thermal Energy
- Newton’s law of universal gravitation

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