Luttrell 2012
8
Name: ______________________
Date: _____
1c - Number Systems
Mathematicians use short-hand notation when referring to number systems:
N
- natural,
Z
- integer,
Q
- rational,
R
- real,
C
- complex.
1. Check off which number systems the following numbers are:
N
Z
Q
R
C
π
3.4
0 81
.
27
0
2. How many minutes are there in two and one half days?
3. How many seconds are there in a day?
4. Some rational numbers can be expressed in decimal form. Express the following in decimal,
showing all work:
a. ¼
b.
1
6
c.
1
9
d.
5
12
e.
7
100
5. Explain which decimals are rational and which are irrational.
For example: π ≈ 3.141592... is irrational.
6. Write the following decimals as a ratio of two integers:
a. 0.315
b. 3.151515...