4.4: Models and Operations with Integers
- Page ID
- 51006
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Groups of Numbers
The largest group is the Real Number System. The Real Numbers hold true for all numbers learned in elementary school. The only numbers, which do not belong in the Real Number group, are imaginary numbers, which are not learned until high school.
Within the Real Numbers are the Rational and Irrational Groups. Rational numbers are any number which can be written as a fraction, whereas any irrational number is non-terminating (never stops) and non-repeating. If a decimal has a pattern, it can be made into a fraction.
Integers, the next smallest group, include negative numbers, zero and positive numbers, without any fractions or decimals.
Whole numbers, like Integers, cannot have fractions or decimals. In addition, Whole Numbers start with zero include positive numbers. No negatives.
The smallest group of numbers are the Natural Numbers. They are like Whole Numbers, except without zero.
Modeling Signed Numbers
\(\color {Blue} \bullet \quad \) Represents a Positive Number
\(\bullet \quad \) Represents a Negative Number
Operations with Signed Numbers
Operations on the Number Line
Table of Numerical and Algebraic Properties
Practice Problems
Put the following numbers into their correct group(s).
- 16
- 3.14
- \(\pi\)
- \(\sqrt{16}\)
- \(\sqrt{23}\)
- -8
- 0
- 1
Add or subtract the following integers.
- -16 + 45
- 91 – (-56)
- 64 – 341
- 78 + (-89)
- 232 + 44
State the property used for each equation.
- 5(4 + 2) = 20 + 10
- 4(3)(12) = 4(12)(3)
- 42 = 42
- If x = 3 and x = y, then y = 3
Extension: Methods of Teaching Mathematics
Part 1
Watch a full 45-minute lesson and write the corresponding lesson plan for it. See Canvas for more detailed instructions.
Part 2
Make sure you are working on Khan Academy throughout the semester.