diff --git a/src/math/drem.c b/src/math/drem.c
new file mode 100644
index 0000000..ec4bd33
--- /dev/null
+++ b/src/math/drem.c
@@ -0,0 +1,44 @@
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <stdio.h>
+#include "mtest.h"
+
+static struct dd_d t[] = {
+#include "sanity/remainder.h"
+#include "special/remainder.h"
+
+};
+
+int main(void)
+{
+	#pragma STDC FENV_ACCESS ON
+	double y;
+	float d;
+	int e, i, err = 0;
+	struct dd_d *p;
+
+	for (i = 0; i < sizeof t/sizeof *t; i++) {
+		p = t + i;
+
+		if (p->r < 0)
+			continue;
+		fesetround(p->r);
+		feclearexcept(FE_ALL_EXCEPT);
+		y = drem(p->x, p->x2);
+		e = fetestexcept(INEXACT|INVALID|DIVBYZERO|UNDERFLOW|OVERFLOW);
+
+		if (!checkexcept(e, p->e, p->r)) {
+			printf("%s:%d: bad fp exception: %s drem(%a,%a)=%a, want %s",
+				p->file, p->line, rstr(p->r), p->x, p->x2, p->y, estr(p->e));
+			printf(" got %s\n", estr(e));
+			err++;
+		}
+		d = ulperr(y, p->y, p->dy);
+		if (!checkcr(y, p->y, p->r)) {
+			printf("%s:%d: %s drem(%a,%a) want %a got %a ulperr %.3f = %a + %a\n",
+				p->file, p->line, rstr(p->r), p->x, p->x2, p->y, y, d, d-p->dy, p->dy);
+			err++;
+		}
+	}
+	return !!err;
+}
diff --git a/src/math/dremf.c b/src/math/dremf.c
new file mode 100644
index 0000000..ed16ede
--- /dev/null
+++ b/src/math/dremf.c
@@ -0,0 +1,44 @@
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <stdio.h>
+#include "mtest.h"
+
+static struct ff_f t[] = {
+#include "sanity/remainderf.h"
+#include "special/remainderf.h"
+
+};
+
+int main(void)
+{
+	#pragma STDC FENV_ACCESS ON
+	float y;
+	float d;
+	int e, i, err = 0;
+	struct ff_f *p;
+
+	for (i = 0; i < sizeof t/sizeof *t; i++) {
+		p = t + i;
+
+		if (p->r < 0)
+			continue;
+		fesetround(p->r);
+		feclearexcept(FE_ALL_EXCEPT);
+		y = dremf(p->x, p->x2);
+		e = fetestexcept(INEXACT|INVALID|DIVBYZERO|UNDERFLOW|OVERFLOW);
+
+		if (!checkexcept(e, p->e, p->r)) {
+			printf("%s:%d: bad fp exception: %s dremf(%a,%a)=%a, want %s",
+				p->file, p->line, rstr(p->r), p->x, p->x2, p->y, estr(p->e));
+			printf(" got %s\n", estr(e));
+			err++;
+		}
+		d = ulperrf(y, p->y, p->dy);
+		if (!checkcr(y, p->y, p->r)) {
+			printf("%s:%d: %s dremf(%a,%a) want %a got %a ulperr %.3f = %a + %a\n",
+				p->file, p->line, rstr(p->r), p->x, p->x2, p->y, y, d, d-p->dy, p->dy);
+			err++;
+		}
+	}
+	return !!err;
+}