Explanation

To know the cardinal numbers, you need to study (leren) a few of them. Good news is, if you know the first twenty and the tens, you don't need to study much more. Except for some rules.
 
1
one
2
two
3
three
4
four
5
five
6
six
7
seven
8
eight
9
nine
10
ten
11
eleven
12
twelve
13
thirteen
14
fourteen
15
fifteen
16
sixteen
17
seventeen
18
eighteen
19
nineteen
20
twenty
Study these by heart! Which means, like your vocabulary on p. 84, you need to memorize these.
 
The rules that follow are these:
 
1. The numbers between 21-99 get a "-" in between the ten and the number, like this:
2. From 100 - 120, you start with "one hundred and ...(number)". For example:
3. This last rule is actually a combination of rules 1 and 2. From 121 on, you get a "-" between the ten and the number. That looks like this: