diff --git a/content/contracts-sui/1.x/index.mdx b/content/contracts-sui/1.x/index.mdx
index 6c03576..9bae3e7 100644
--- a/content/contracts-sui/1.x/index.mdx
+++ b/content/contracts-sui/1.x/index.mdx
@@ -46,19 +46,19 @@ Create `sources/quickstart.move`:
 ```move
 module my_sui_app::quickstart;
 
-use openzeppelin_math::{rounding, u64};
-use std::option;
+use openzeppelin_math::rounding;
+use openzeppelin_math::u64::{mul_div, sqrt};
 
 // === Functions ===
 
 public fun quote_with_fee(amount: u64): u64 {
     // 2.5% fee, rounded to nearest.
-    let quoted = amount.mul_div(1025u64, 1000u64, rounding::nearest());
+    let quoted = mul_div(amount,1025u64, 1000u64, rounding::nearest());
     quoted.destroy_some()
 }
 
 public fun sqrt_floor(value: u64): u64 {
-    value.sqrt(rounding::down())
+    sqrt(value, rounding::down())
 }
 ```