diff --git a/src/number.c b/src/number.c
index 1f2e2b9e..4b05dfc3 100644
--- a/src/number.c
+++ b/src/number.c
@@ -78,6 +78,46 @@ pic_number_abs(pic_state *pic)
   return pic_float_value(fabs(f));
 }
 
+static pic_value
+pic_number_floor_quotient(pic_state *pic)
+{
+  double f,g;
+
+  pic_get_args(pic, "ff", &f, &g);
+  return pic_float_value(floor(f/g));
+}
+
+static pic_value
+pic_number_floor_remainder(pic_state *pic)
+{
+  double f,g,q;
+
+  pic_get_args(pic, "ff", &f, &g);
+
+  q = floor(f/g);
+  return pic_float_value(f - g * q);
+}
+
+static pic_value
+pic_number_truncate_quotient(pic_state *pic)
+{
+  double f,g;
+
+  pic_get_args(pic, "ff", &f, &g);
+  return pic_float_value(trunc(f/g));
+}
+
+static pic_value
+pic_number_truncate_remainder(pic_state *pic)
+{
+  double f,g,q;
+
+  pic_get_args(pic, "ff", &f, &g);
+
+  q = trunc(f/g);
+  return pic_float_value(f - g * q);
+}
+
 static pic_value
 pic_number_floor(pic_state *pic)
 {
@@ -257,6 +297,12 @@ pic_init_number(pic_state *pic)
 
   pic_defun(pic, "abs", pic_number_abs);
 
+  pic_defun(pic, "floor-quotient", pic_number_floor_quotient);
+  pic_defun(pic, "floor-remainder", pic_number_floor_remainder);
+  pic_defun(pic, "truncate-quotient", pic_number_truncate_quotient);
+  pic_defun(pic, "truncate-remainder", pic_number_truncate_remainder);
+  pic_gc_arena_restore(pic, ai);
+
   pic_defun(pic, "floor", pic_number_floor);
   pic_defun(pic, "ceiling", pic_number_ceiling);
   pic_defun(pic, "truncate", pic_number_truncate);