diff --git a/aula55.py b/aula55.py
new file mode 100644
index 0000000..a879546
--- /dev/null
+++ b/aula55.py
@@ -0,0 +1,14 @@
+"""
+Imprecisão de ponto flutuante
+Double-precision floating-point format IEEE 754
+https://en.wikipedia.org/wiki/Double-precision_floating-point_format
+https://docs.python.org/pt-br/3/tutorial/floatingpoint.html
+"""
+import decimal
+
+numero_1 = decimal.Decimal('0.1')
+numero_2 = decimal.Decimal('0.7')
+numero_3 = numero_1 + numero_2
+print(numero_3)
+print(f'{numero_3:.2f}')
+print(round(numero_3, 2))