- (5 min) Mental Math
- What is the square root of 36? [6]
- What is square root of 49? [7]
- What is square root of 81? [9]
- What is cube root of 8? [2]
- What is cube root of 27? [3]

- (10 min) VOLUMES

To calculate the volume of a 3-dimensional geometrical solid, find the area of the base and multiply by its height. Volumes are expressed in*cubic*units. Here are some formulas for volumes:- Rectangular prism (a box): volume = length x width x height

Example: A box that is 3 by 4 by 5 feet has a volume of 60 cu ft.

- Cube whose side has length S: S x S x S

Example: A cube whose side is 3 inches long: volume = 27 cu in. - Cylinder: volume = base x height = pi x r
^{2}x h

Example: Radius = 2, height = 5, volume = 20 pi or 62.8 - Triangular prism: volume = base x height = (length x width/2) x
height

Example: Length = 2, width = 3, height = 4, volume = 12

- Rectangular prism (a box): volume = length x width x height
- ABSOLUTE VALUES

Absolute value is the positive value of a number. It is written with straight bars on each side: | - 6 | = 6 and also | 6 | = 6.

For x = - 5, | x | = 5

Why is this important? Well it gives us the size of a number without worrying about its sign. It is useful in calculating distance from point A to point B when point B is smaller than point A.

- In-class exercise. No homework this week. This is the last
week!

- MATH JEOPARDY

This week's competition is Math Jeopardy. You play it with the class using the rules of jeopardy. This game is a change of pace and gives the kids some interesting practice on vocabulary. If they do not know a word, explain it to them as you go. You can explain the answers, too as you go along.

The kids take turns picking a category and value, you read the questions, and the first kid with a hand up gets to answer. Answers must be phrased in the form of a question. If you read: "the first even number" the correct answer is "What is 4?" Paper and pencil are OK. Calculators are OK, although they will be a big disadvantage, as they will slow the kid down.

Give 1 of a prize (1 M&M or 1 Skittle) for a $100 answer, 2 for a $200 answer, and 10 for a $1000 answer. The kids may either eat their earnings or save them to bet on Final Jeopardy. Two big bags of candies should be enough--you will need about 400 pieces to play the entire thing.

Here are some hints about how to adapt this to make it more successful:- Use a transparency projector to display the grid of choices and mark them off as the kids get the answers.
- Instead of displaying the choices, display the questions which have been covered up by little Post-it notes (1/5" by 2" size) Remove the Post-it notes to reveal the questions.
- If one kid dominates the answers, (highly probable) take turns going around the room letting each kid have a turn at a question. If a kid cannot answer the question she or he chose, then pick on someone else who has a hand up. This ensures that everyone is thinking about the question, as they may get a chance as a backup.
- If you have too many kids to play, try forming them into teams of 4 with a spokesman captain. Give the team 15 seconds to answer the question before calling on someone else. In this case, everyone on the team would get the prize.