diff --git a/src/bigmath/chain/segment.hpp b/src/bigmath/chain/segment.hpp
index 402575d..8c86552 100644
--- a/src/bigmath/chain/segment.hpp
+++ b/src/bigmath/chain/segment.hpp
@@ -35,12 +35,26 @@ namespace bigmath {
 
         void set(u8 i, u8 n);
 
+        segment extract(u8 from, u8 to, u8 offset) const;
+
+        void shift_right(u8 places);
+
+        void shift_left(u8 places);
+
         u8 add(const segment& s, u8 carry);
 
         u8 sub(const segment& s, u8 borrow);
 
         std::array<segment, 2> mul_long(const segment& s) const;
 
+        std::array<segment, 2> mul_karatsuba(const segment& s) const;
+
+        div_result<segment> div_long(const segment& s) const;
+
+        segment div_newtonraphson(const segment& s) const;
+
+        segment mod_long(const segment& s) const;
+
         i8 compare(const segment& s) const;
 
         bool isZero() const noexcept;