diff --git a/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java b/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
index b15e411cac..91360dfa46 100644
--- a/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
+++ b/core/src/main/java/com/alibaba/fastjson2/util/IOUtils.java
@@ -317,22 +317,16 @@ public static int writeDecimal(byte[] buf, int off, long unscaledVal, int scale)
                 off = IOUtils.writeInt64(buf, off, div);
                 buf[off] = '.';
 
-                for (int i = 0, end = unscaleValSize - stringSize(rem) - insertionPoint; i < end; ++i) {
-                    buf[++off] = '0';
-                }
-
                 if (scale == 1) {
                     buf[off + 1] = (byte) (rem + '0');
                     return off + 2;
                 } else if (scale == 2) {
                     UNSAFE.putShort(buf, ARRAY_BYTE_BASE_OFFSET + off + 1, PACKED_DIGITS[(int) rem]);
                     return off + 3;
-                } else if (scale == 3) {
-                    int v = DIGITS_K_32[(int) rem];
-                    buf[off + 1] = (byte) (v >> 8);
-                    buf[off + 2] = (byte) (v >> 16);
-                    buf[off + 3] = (byte) (v >> 24);
-                    return off + 4;
+                }
+
+                for (int i = 0, end = unscaleValSize - stringSize(rem) - insertionPoint; i < end; ++i) {
+                    buf[++off] = '0';
                 }
                 return IOUtils.writeInt64(buf, off + 1, rem);
             }
@@ -369,22 +363,16 @@ public static int writeDecimal(char[] buf, int off, long unscaledVal, int scale)
                 off = IOUtils.writeInt64(buf, off, div);
                 buf[off] = '.';
 
-                for (int i = 0, end = unscaleValSize - stringSize(rem) - insertionPoint; i < end; ++i) {
-                    buf[++off] = '0';
-                }
-
                 if (scale == 1) {
                     buf[off + 1] = (char) (rem + '0');
                     return off + 2;
                 } else if (scale == 2) {
                     UNSAFE.putInt(buf, ARRAY_CHAR_BASE_OFFSET + ((off + 1) << 1), PACKED_DIGITS_UTF16[(int) rem]);
                     return off + 3;
-                } else if (scale == 3) {
-                    long v = DIGITS_K_64[(int) rem];
-                    buf[off + 1] = (char) (v >> 16);
-                    buf[off + 2] = (char) (v >> 32);
-                    buf[off + 3] = (char) (v >> 48);
-                    return off + 4;
+                }
+
+                for (int i = 0, end = unscaleValSize - stringSize(rem) - insertionPoint; i < end; ++i) {
+                    buf[++off] = '0';
                 }
                 return IOUtils.writeInt64(buf, off + 1, rem);
             }
diff --git a/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1831.java b/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1831.java
index 47978745c3..1eb4d5a3fa 100644
--- a/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1831.java
+++ b/core/src/test/java/com/alibaba/fastjson2/issues_1800/Issue1831.java
@@ -10,9 +10,19 @@
 public class Issue1831 {
     @Test
     public void test() {
-        String str = "1.09600000";
-        BigDecimal decimal = new BigDecimal(str);
-        assertEquals(str, JSON.toJSONString(decimal));
-        assertEquals(str, new String(JSON.toJSONBytes(decimal)));
+        String[] strings = new String[] {
+                "1.6",
+                "1.06",
+                "1.66",
+                "1.096",
+                "1.696",
+                "1.09600000",
+                "1.096000001"
+        };
+        for (String str : strings) {
+            BigDecimal decimal = new BigDecimal(str);
+            assertEquals(str, JSON.toJSONString(decimal));
+            assertEquals(str, new String(JSON.toJSONBytes(decimal)));
+        }
     }
 }