(2)の10進数への変換
= 1 × 23 ＋ 0 × 22 ＋ 1 × 21 ＋ 1 × 20
= 1 × 8 ＋ 0 × 4 ＋ 1 × 2 ＋ 1 × 1
= 8 ＋ 0 ＋ 2 ＋ 1
= 11