1. Lesson 4.1 How do you write the prime factorization of a number?
You will use a factor tree to help you. You will write the number as a product of its prime factors.

2. Lesson 4.2
How do you find the greatest common factor (GCF) of two or more numbers?
Write the prime factorization of each number.
Find the common prime factors.
Multiply the factors. Your product is the GCF.

3. Lesson 4.3 How do you write equivalent fractions?
Multiply or divide the numerator and denominator by the same nonzero number.

4. Lesson 4.4
How do you find the least common multiple (LCM) of two or more numbers?
Write the prime factorization of each number.
Circle the greatest power of each prime factor.
Find the product of the circled factors. This is your LCM.

5. Lesson 4.5 How do you multiply and divide powers?
To multiply powers with the same base, add their exponents.
To divide two powers with the same nonzero base, subtract the exponent of the denominator from the exponent of the numerator.

6. Lesson 4.6
How do you simplify powers with negative and zero exponents?
To simplify powers with negative exponents:
Reciprocate the power and make the exponent positive
𝑎 −𝑛 = 1 𝑎 𝑛
To simplify powers with a zero exponent:
The entire power equals the number 1
𝑎 0 =1

7. Lesson 4.7 How do you write numbers using scientific notation?
Move your decimal point to the left or the right to create a number between 1 and 10.
Count the number of places you moved the decimal point, this is your exponent.
If you moved to the left, it’s positive.
If you moved to the right, it’s negative.
Write as a product of the number and the power of 10.