Several tests for divisibility are listed in the following paragraphs: 1. A number is divisible by 2 if its right-hand digit is even. 2. A number is divisible by 3 if the sum of its digits is divisible by 3. For example, the digits of the number 6,561 add

California Water Delivery System
Local Projects
Los Angeles Aqueduct (1913) M okelumne Aqueduct (1929) Hetch Hetch y Aqueduct (1934) Colorado River Aqueduct (1941) San Diego Aqueduct (1947 - 1960) Petaluma-Sonoma Aqueducts (1961)
State Water Project (SW

~ U.S. History Notes ~
Early Exploration, Colonial Era, & War for Independence
European Exploration & Settlement
(Struggle for N. American control during Colonial times, American Indian conflict & cooperation)
In pursuit of sailing to Asia, for spice trad

Prime Numbers & Factors 1. Which of the f ollowing are prim e num bers and which ar e comp osite numbers ? 25, 7, 18, 29, 51 2. What pr ime numbers ar e factors of 36 ? 3. Which of the f ollowing are multiples of 3 ? 45, 53 , 51, 39, 47 4. Find the prime

Prime Numbers & Factors 1. Which of the f ollowing are prim e num bers and which ar e comp osite numbers ? 25, 7, 18, 29, 51 2. What pr ime numbers ar e factors of 36 ? 3. Which of the f ollowing are multiples of 3 ? 45, 53 , 51, 39, 47 4. Find the prime

~ Plant Parts & Systems ~
The parts of a plant can be divided into two groups, sexual reproductive parts and vegetative parts. Sexual reproductive parts are those involved in the production of seed. They include flower buds, flowers, fruit, and seeds. The

Prime Numbers & Factors 1. Which of the following are prime numbers and which are composite numbers ? 25, 7, 18, 29, 51 2. What prime numbers are factors of 36? 3. Which of the following are multiples of 3 ? 45, 53, 51, 39, 47 4. Find the prime factors of

Practice problems. 1. A mast at the top of a building casts a shadow whose tip is 48 feet from the base of the building. If the building is 12 feet high and its shadow is 32 feet long, what is the length of the mast? (NOTE: If the length of the mast is x,

LIFE SCIENCES: RELEVANT STANDARDS
You will most likely cover the following standards as your students participate in the Tech Challenge.
Grade 6- Ecology
Standard 5: Organisms in ecosystems exchange energy and nutrients among themselves and with the envir

Geometry
Perimeter: Perimeter is defined as the distance around an object. For a polygon (an object with many sides) the perimeter is the sum of the lengths of the sides. For a circle the distance around the outside is called the circumference. Rectangle

Geometry Exercises
1. Identify which of the following units could be measures of perimeter: a. square inches (in2) b. meters (m) c. cubic feet (ft3) d. cubic meters (m3) g. square yards (yd2) e. miles (mi) h. cubic inches (in3) f. square centimeters (cm2)

ALGEBRAIC EXPRESSIONS An algebraic expression is made up of the signs and symbols of algebra. These symbols include the Arabic numerals, literal numbers, the signs of operation, and so forth. Such an expression represents one number or one quantity. Evalu