Атрибут span

<col span='число'>

<!DOCTYPE html>
<html lang='ru'>
<head>
<meta charset='UTF-8'>
<meta name='viewport' content='width=device-width, initial-scale=1.0'>
<title>Document</title>
</head>
<body>
<table width='150' border='1'>
<col width='150'>
<col span='5' width='50' align='center'>
<col span='4' width='75' align='center'>
<tr>
<td></td>
<td>Кирилл</td>
<td>Александр</td>
<td>Анастасия</td>
<td>Матвей</td>
</tr>
<tr>
<td>Оценка за 1 четверть</td>
<td>5</td>
<td>5</td>
<td>4</td>
<td>5</td>
</tr>
<tr>
<td>Оценка за 2 четверть</td>
<td>3</td>
<td>2</td>
<td>5</td>
<td>5</td>
</tr>
<tr>
<td>Оценка за 3 четверть</td>
<td>5</td>
<td>4</td>
<td>5</td>
<td>4</td>
</tr>
</table>
</body>
</html>