diff --git a/asm/math_util.s b/asm/math_util.s
deleted file mode 100644
index 906706d61..000000000
--- a/asm/math_util.s
+++ /dev/null
@@ -1,202 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start sub_8151534
-sub_8151534: @ 8151534
-	push {lr}
-	lsls r0, 16
-	asrs r0, 16
-	lsls r1, 16
-	asrs r1, 16
-	muls r0, r1
-	adds r1, r0, 0
-	cmp r0, 0
-	bge _08151548
-	adds r1, 0xFF
-_08151548:
-	lsls r0, r1, 8
-	asrs r0, 16
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151534
-
-	thumb_func_start sub_8151550
-sub_8151550: @ 8151550
-	push {lr}
-	adds r3, r1, 0
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r3, 16
-	asrs r3, 16
-	lsls r2, 16
-	asrs r2, 16
-	muls r3, r2
-	movs r1, 0x1
-	lsls r1, r0
-	adds r0, r3, 0
-	bl __divsi3
-	lsls r0, 16
-	asrs r0, 16
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151550
-
-	thumb_func_start sub_8151574
-sub_8151574: @ 8151574
-	push {r4-r7,lr}
-	adds r2, r1, 0
-	adds r4, r0, 0
-	asrs r5, r0, 31
-	asrs r3, r2, 31
-	adds r1, r5, 0
-	adds r0, r4, 0
-	bl __muldi3
-	adds r5, r1, 0
-	adds r4, r0, 0
-	adds r7, r5, 0
-	adds r6, r4, 0
-	cmp r5, 0
-	bge _0815159A
-	movs r6, 0xFF
-	movs r7, 0
-	adds r6, r4
-	adcs r7, r5
-_0815159A:
-	lsls r3, r7, 24
-	lsrs r2, r6, 8
-	adds r0, r3, 0
-	orrs r0, r2
-	asrs r1, r7, 8
-	adds r5, r1, 0
-	adds r4, r0, 0
-	adds r0, r4, 0
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151574
-
-	thumb_func_start sub_81515B0
-sub_81515B0: @ 81515B0
-	push {lr}
-	lsls r0, 16
-	lsrs r0, 16
-	lsls r1, 16
-	asrs r1, 16
-	cmp r1, 0
-	beq _081515CC
-	lsls r0, 16
-	asrs r0, 8
-	bl __divsi3
-	lsls r0, 16
-	asrs r0, 16
-	b _081515CE
-_081515CC:
-	movs r0, 0
-_081515CE:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_81515B0
-
-	thumb_func_start sub_81515D4
-sub_81515D4: @ 81515D4
-	push {lr}
-	lsls r0, 24
-	lsrs r3, r0, 24
-	lsls r1, 16
-	lsrs r0, r1, 16
-	lsls r2, 16
-	asrs r1, r2, 16
-	cmp r1, 0
-	beq _081515F6
-	lsls r0, 16
-	asrs r0, 16
-	lsls r0, r3
-	bl __divsi3
-	lsls r0, 16
-	asrs r0, 16
-	b _081515F8
-_081515F6:
-	movs r0, 0
-_081515F8:
-	pop {r1}
-	bx r1
-	thumb_func_end sub_81515D4
-
-	thumb_func_start sub_81515FC
-sub_81515FC: @ 81515FC
-	push {r4-r6,lr}
-	adds r6, r1, 0
-	cmp r6, 0
-	beq _0815161C
-	adds r2, r0, 0
-	asrs r3, r0, 31
-	lsrs r5, r2, 24
-	lsls r4, r3, 8
-	adds r1, r5, 0
-	orrs r1, r4
-	lsls r0, r2, 8
-	adds r2, r6, 0
-	asrs r3, r6, 31
-	bl __divdi3
-	b _0815161E
-_0815161C:
-	movs r0, 0
-_0815161E:
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_81515FC
-
-	thumb_func_start sub_8151624
-sub_8151624: @ 8151624
-	push {lr}
-	adds r1, r0, 0
-	movs r0, 0x80
-	lsls r0, 9
-	lsls r1, 16
-	asrs r1, 16
-	bl __divsi3
-	lsls r0, 16
-	asrs r0, 16
-	pop {r1}
-	bx r1
-	thumb_func_end sub_8151624
-
-	thumb_func_start sub_815163C
-sub_815163C: @ 815163C
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	movs r2, 0x80
-	lsls r2, 1
-	lsls r2, r0
-	lsls r1, 16
-	asrs r1, 16
-	adds r0, r2, 0
-	bl __divsi3
-	lsls r0, 16
-	asrs r0, 16
-	pop {r1}
-	bx r1
-	thumb_func_end sub_815163C
-
-	thumb_func_start sub_815165C
-sub_815165C: @ 815165C
-	push {lr}
-	adds r2, r0, 0
-	ldr r1, _08151674
-	ldr r0, _08151670
-	asrs r3, r2, 31
-	bl __divdi3
-	pop {r1}
-	bx r1
-	.align 2, 0
-_08151670: .4byte 0x00010000
-_08151674: .4byte 0x00000000
-	thumb_func_end sub_815165C
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/ld_script.txt b/ld_script.txt
index efcf72a6a..116023c56 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -191,7 +191,7 @@ SECTIONS {
         src/battle_controller_link_partner.o(.text);
         src/battle_message.o(.text);
         asm/cable_car.o(.text);
-        asm/math_util.o(.text);
+        src/math_util.o(.text);
         asm/roulette_util.o(.text);
         asm/cable_car_util.o(.text);
         src/save.o(.text);
diff --git a/src/math_util.c b/src/math_util.c
new file mode 100644
index 000000000..83935454a
--- /dev/null
+++ b/src/math_util.c
@@ -0,0 +1,86 @@
+#include "global.h"
+
+s16 sub_8151534(s16 x, s16 y)
+{
+    s32 result;
+
+    result = x;
+    result *= y;
+    result /= 256;
+    return result;
+}
+
+s16 sub_8151550(u8 s, s16 x, s16 y)
+{
+    s32 result;
+
+    result = x;
+    result *= y;
+    result /= (1 << s);
+    return result;
+}
+
+s32 sub_8151574(s32 x, s32 y)
+{
+    s64 result;
+
+    result = x;
+    result *= y;
+    result /= 256;
+    return result;
+}
+
+s16 sub_81515B0(s16 x, s16 y)
+{
+    if (y == 0)
+    {
+        return 0;
+    }
+    return (x << 8) / y;
+}
+
+s16 sub_81515D4(u8 s, s16 x, s16 y)
+{
+    if (y == 0)
+    {
+        return 0;
+    }
+    return (x << s) / y;
+}
+
+s32 sub_81515FC(s32 x, s32 y)
+{
+    s64 _x;
+
+    if (y == 0)
+    {
+        return 0;
+    }
+    _x = x;
+    _x *= 256;
+    return _x / y;
+}
+
+s16 sub_8151624(s16 y)
+{
+    s32 x;
+
+    x = 0x10000;
+    return x / y;
+}
+
+s16 sub_815163C(u8 s, s16 y)
+{
+    s32 x;
+
+    x = 0x100 << s;
+    return x / y;
+}
+
+s32 sub_815165C(s32 y)
+{
+    s64 x;
+
+    x = 0x10000;
+    return x / y;
+}