diff --git a/src/pocketpy.h b/src/pocketpy.h
index 9c775b33..c75c1400 100644
--- a/src/pocketpy.h
+++ b/src/pocketpy.h
@@ -577,6 +577,9 @@ void add_module_math(VM* vm){
     vm->bind_func<1>(mod, "tan", CPP_LAMBDA(vm->PyFloat(tan(vm->num_to_float(args[0])))));
     vm->bind_func<1>(mod, "isnan", CPP_LAMBDA(vm->PyBool(std::isnan(vm->num_to_float(args[0])))));
     vm->bind_func<1>(mod, "isinf", CPP_LAMBDA(vm->PyBool(std::isinf(vm->num_to_float(args[0])))));
+    vm->bind_func<1>(mod, "fabs", CPP_LAMBDA(vm->PyFloat(std::fabs(vm->num_to_float(args[0])))));
+    vm->bind_func<1>(mod, "floor", CPP_LAMBDA(vm->PyInt(std::floor(vm->num_to_float(args[0])))));
+    vm->bind_func<1>(mod, "ceil", CPP_LAMBDA(vm->PyInt(std::ceil(vm->num_to_float(args[0])))));
 }
 
 void add_module_dis(VM* vm){
diff --git a/tests/_math.py b/tests/_math.py
index 535b8727..add480d9 100644
--- a/tests/_math.py
+++ b/tests/_math.py
@@ -1,4 +1,4 @@
-from math import log, log10, log2, sin, cos, tan, e, pi, isnan, isinf
+from math import log, log10, log2, sin, cos, tan, e, pi, isnan, isinf, fabs, floor, ceil
 
 def isclose(a, b):
     return abs(a-b) < 0.000001
@@ -16,4 +16,11 @@ a = -0.1
 a = a**a
 assert isnan(a)
 assert not isinf(a)
-assert isinf(float("inf"))
\ No newline at end of file
+assert isinf(float("inf"))
+
+assert isclose(fabs(-1.2), 1.2)
+
+assert floor(1.2) == 1
+assert floor(-1.2) == -2
+assert ceil(1.2) == 2
+assert ceil(-1.2) == -1
\ No newline at end of file