Chapter 16: Number Theory

Lesson 1: Divisibilty Rules. Objective: To use divisibility rules for 2, 3, 5, 9, and 10.

Lesson 2: Factors and Multiples. Objective: To find factors and multiples using arrays and number lines.

Lesson 3: Prime and Composite Numbers. Objective: To identify prime and composite numbers using arrays.

Lesson 4: Problem Solving Strategy: Find a Pattern. Objective: To solve problems using the strategy *find a pattern*.

Lesson 5: Square Numbers. Objective: To find square numbers and the square roots of numbers.

Vocabulary: factor, multiple, divisible, prime number, composite number, square number, square root

**factor:** a number that is multiplied by another to find a product

**multiple:** a number that is the product of a given number and another whole number

**divisible:** a number that is divisible by a number if it is capable of beig dividend by that number without a remainder

**prime number: **a number that has exactly two factors, 1 and the number itself

**composite number:** a number that has more than two factors

**square number:** a number that is the product of any number and itself

**square root: **one of two equal factors of a number

Our textbook website: www.harcourtschool.com

Some good practice websites:

http://www.gamequarium.com/placevalue.html

http://www.softschools.com/math/games/

www.multiplication.com

www.funbrain.com