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HTML
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<head>
<title>Titolo Pagina</title>
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<body>
<div>
<h1>Trucchi matematici</h1>
</div>
<div>
<ul>
<li> Sommare numero a <b>2 </b> cifre più numero a <b> 2 </b> cifre</li>
<li> Sommare numero a <b>3 </b> cifre più numero a <b> 2 </b> cifre</li>
<li> Sommare numero a <b>3 </b> cifre più numero a <b> 3 </b> cifre</li>
</ul>
</div>
<ol>
<div class="div1">
<li> Spiegazione 2 cifre più 2 cifre : </li>
<p>
Es. 25 + 98
</p>
<p>
(25 + 90) + 8
</p>
<p>
115 + 8
</p>
<p>
123
</p>
</div> <br>
<div class="div2">
<li> Spiegazione 3 cifre più 2 cifre : </li>
<p>
Es1 831 + 65
</p>
<p>
(83+6) ; (1+5)
</p>
<p>
89 ; 6
</p>
<p>
896
</p>
<p>
Es2 867 + 58
</p>
<p>
(86+5) ; (7+8)
</p>
<p>
91 ; 15
</p>
<p>
Dato che il numero supera l'unità decimale (maggiore di 9), allora si riporta un'unità decimale quindi
</p>
<p>
925
</p>
</div> <br>
<div class="div3">
<li> Spiegazione 3 cifre più 3 cifre : </li>
<p>
Es1 624 + 361
</p>
<p>
(62+36) ; (4+1)
</p>
<p>
62+36 diventa (62+30) + 6 ; (4+1)
</p>
<p>
92 + 6 ; (5)
</p>
<p>
98 ; (5)
</p>
<p>
985
</p>
<p>
Es2 758 + 869
</p>
<p>
(75+86) ; (8+9)
</p>
<p>
75+86 diventa (75+80) +6 ; (8+9)
</p>
<p>
155 + 6 ; (17)
</p>
<p>
161 ; (17)
</p>
<p>
Dato che il numero supera l'unità decimale (maggiore di 9), allora si riporta un'unità decimale quindi
</p>
<p>
1627
</p>
</div>
</ol>
<div class="div4">
<strong> Facciamo una prova </strong> <br><br>
Inserisci il primo numero <input id="in1" type="number" placeholder="numero a 2 cifre"> <br> <br>
Inserisci il secondo numero <input id="in2" type="number" placeholder="numero a 2 cifre"> <br> <br>
Ora clicca sul bottone per visualizzare la somma : <button onclick="somma()">
cliccami
</button> <br>
<i> La somma è : </i>
<p id="pro2">
</p>
</div>
</body>
</html>
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CSS
h1 {
color:red;
}
b {
color:blue;
}
ul {
border: solid 4px green;
display:inline-block;
list-style:none;
}
div {
text-align:center;
}
li::before{
content:"→";
padding-right:30px;
color:brown;
}
.div1{
border:solid 2px cadetblue;
}
.div2{
border:solid 2px orange;
}
.div3{
border:solid 2px purple;
}
.div4 {
border:solid 2px blue;
}
#pro2 {
color:red;
font-size : 40px;
display : inline-block;
}
button {
color:white;
background-color:red;
}
i {
font-size:25px;
color:green;
}
strong {
color:blue;
font-size:18px;
text-decoration:underline;
}
-----
JAVASCRIPT
function somma () {
let a = document.getElementById("in1");
let b = document.getElementById("in2");
let ris = Number(in1.value) + Number(in2.value);
document.getElementById("pro2").innerHTML = ris;
}
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