You can use place value to figure out how much each digit in a number is worth. Each place has a value of 10 times the place to its right.
For example, the number 45 has 4 in the tens place, and 5 in the ones place. In other words, 45 has 4 tens and 5 ones.
The number 372 has 3 in the hundreds place, 7 in the tens place, and 2 in the ones place. In other words, it has 3 hundreds, 7 tens, and 2 ones.
位取りを使えば、その数のそれぞれの数字がどれくらい大きいかが分かります。それぞれの位は、その右の位の10倍に値します。
たとえば、45は、十の位が4、一の位が5です。言い換えると、10が4つと1が5つです
372は、百の位が3、十の位が7、一の位が2です。言い換えると、100が3つ、10が7つ、1が2つです。