How to split a div into multiple rows and columns in css?

Question

I have div subdiv inside maindiv. I want to make the sub div into multiple rows and columns as below.

How to divide the subdiv as below

Answer 1

You can do something like this

div{
  display:inline-block;
  float:left;
  color:#fff;
  font-size:40px;
}

.one{
  width:150px;
  height:200px;
  background:red;
}

.two{
    width:100px;
  height:200px;
  background:lightgreen;
}

.three{
    width:100px;
  height:200px;
}

.four{
  width:100px;
  height:100px;
background:darkblue;
}
.five{
  width:100px;
  height:100px;
background:blue;
}

<div class="one">1</div>
<div class="two">2</div>
<div class="three">
  <div class="four">4</div>
  <div class="five">5</div>
</div>

Answer 2

I know that the question has been answered but there is another way to do this.

You can Achieve it using css grid. read more about css grid

.grid { 
    display: grid;
    grid-template-columns: 10rem 7rem 7rem 7rem;
    grid-template-rows: 7rem 7rem;
    grid-template-areas: 
    "s1 s2 s3"
    "s1 s2 s4"
}
.s1 { 
    grid-area: s1;
    background-color: #FF0000;
}
.s2 { 
    grid-area: s2;
    background-color: #00FF36;
}
.s3 { 
    grid-area: s3;
    background-color: #0030FF;
}
.s4 {
    grid-area: s4;
    background-color: #FF00E4;
}

 <div class="grid">
      <div class="g s1"></div>
      <div class="g s2"></div>
      <div class="g s3"></div>
      <div class="g s4"></div>
 </div>