diff --git a/docs/chapter_data_structure/number_encoding.md b/docs/chapter_data_structure/number_encoding.md
index 4b8b073f8..acc116683 100644
--- a/docs/chapter_data_structure/number_encoding.md
+++ b/docs/chapter_data_structure/number_encoding.md
@@ -119,7 +119,7 @@ $$
 $$
 \begin{aligned}
 \mathrm{S} \in & \{ 0, 1\}, \quad \mathrm{E} \in \{ 1, 2, \dots, 254 \} \newline
-(1 + \mathrm{N}) = & (1 + \sum_{i=0}^{22} b_{i} 2^{i-23}) \subset [1, 2 - 2^{-23}]
+(1 + \mathrm{N}) = & (1 + \sum_{i=0}^{22} b_{i} \times 2^{i-23}) \subset [1, 2 - 2^{-23}]
 \end{aligned}
 $$
 
diff --git a/en/docs/chapter_data_structure/number_encoding.md b/en/docs/chapter_data_structure/number_encoding.md
index a9c6f6aa8..c601630c2 100644
--- a/en/docs/chapter_data_structure/number_encoding.md
+++ b/en/docs/chapter_data_structure/number_encoding.md
@@ -119,7 +119,7 @@ The range of each component is:
 $$
 \begin{aligned}
 \mathrm{S} \in & \{ 0, 1\}, \quad \mathrm{E} \in \{ 1, 2, \dots, 254 \} \newline
-(1 + \mathrm{N}) = & (1 + \sum_{i=0}^{22} b_{i} 2^{i-23}) \subset [1, 2 - 2^{-23}]
+(1 + \mathrm{N}) = & (1 + \sum_{i=0}^{22} b_{i} \times 2^{i-23}) \subset [1, 2 - 2^{-23}]
 \end{aligned}
 $$
 
diff --git a/zh-hant/docs/chapter_data_structure/number_encoding.md b/zh-hant/docs/chapter_data_structure/number_encoding.md
index c162fa81a..d0a99d074 100644
--- a/zh-hant/docs/chapter_data_structure/number_encoding.md
+++ b/zh-hant/docs/chapter_data_structure/number_encoding.md
@@ -119,7 +119,7 @@ $$
 $$
 \begin{aligned}
 \mathrm{S} \in & \{ 0, 1\}, \quad \mathrm{E} \in \{ 1, 2, \dots, 254 \} \newline
-(1 + \mathrm{N}) = & (1 + \sum_{i=0}^{22} b_{i} 2^{i-23}) \subset [1, 2 - 2^{-23}]
+(1 + \mathrm{N}) = & (1 + \sum_{i=0}^{22} b_{i} \times 2^{i-23}) \subset [1, 2 - 2^{-23}]
 \end{aligned}
 $$