diff --git a/sqlite_utils/db.py b/sqlite_utils/db.py
index cb249b3..edac5d9 100644
--- a/sqlite_utils/db.py
+++ b/sqlite_utils/db.py
@@ -1,6 +1,7 @@
 from .utils import sqlite3, OperationalError, suggest_column_types, column_affinity
 from collections import namedtuple, OrderedDict
 import datetime
+import decimal
 import hashlib
 import itertools
 import json
@@ -42,6 +43,7 @@ COLUMN_TYPE_MAPPING = {
     datetime.datetime: "TEXT",
     datetime.date: "TEXT",
     datetime.time: "TEXT",
+    decimal.Decimal: "FLOAT",
     None.__class__: "TEXT",
     # SQLite explicit types
     "TEXT": "TEXT",
@@ -1325,6 +1327,8 @@ def chunks(sequence, size):
 
 
 def jsonify_if_needed(value):
+    if isinstance(value, decimal.Decimal):
+        return float(value)
     if isinstance(value, (dict, list, tuple)):
         return json.dumps(value, default=repr)
     elif isinstance(value, (datetime.time, datetime.date, datetime.datetime)):
diff --git a/tests/test_create.py b/tests/test_create.py
index 79123b8..22e4b7b 100644
--- a/tests/test_create.py
+++ b/tests/test_create.py
@@ -9,6 +9,7 @@ from sqlite_utils.db import (
 from sqlite_utils.utils import sqlite3
 import collections
 import datetime
+import decimal
 import json
 import pathlib
 import pytest
@@ -132,6 +133,7 @@ def test_create_table_with_not_null(fresh_db):
             [{"name": "create", "type": "TEXT"}, {"name": "table", "type": "TEXT"}],
         ),
         ({"day": datetime.time(11, 0)}, [{"name": "day", "type": "TEXT"}]),
+        ({"decimal": decimal.Decimal("1.2")}, [{"name": "decimal", "type": "FLOAT"}]),
     ),
 )
 def test_create_table_from_example(fresh_db, example, expected_columns):