Fundamentals of Math

Fundamentals of Mathematics

Practice 1.3 Directions: Use your knowledge of factors and multiples to answer the following questions.

1. Circle all the prime numbers in the list:

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15

2. What is the prime factorization of 60?

3. List all the factors of 120.

4. List the first five multiples of 72.

Answer Key on Page 116

1.4 Operations with Integers As mentioned previously, one subset of Real numbers is Integers. Integers are like are just like whole numbers (no fractions or decimals), but they also include negative numbers:

. . . −5, −4, −3, −2, −1, 0, 1, 2, 3, 4, 5. ..

For every positive integer, there is a negative counterpart. Negative integers have a " − " sign in front of the number to indicate that its value is less than 0. Positive numbers can have a " + " sign in front of the number to indicate its value is greater than 0. However, often if a number has no sign in front of it, then it is considered to be positive.

Zero is a neutral number. It is neither positive or negative.

Adding/Subtracting Integers We can add and subtract integers together using a number line. For example, −2 + 5

The first number (−2) tells you where to start on the number line. The sign of the second number tells you the direction you will travel in. For a positive number (+) you travel to the right, and for a negative number (−) you travel to the left. The second number (5) tells you howmany units to move.

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