diff --git a/packages/roosterjs-content-model-plugins/lib/autoFormat/numbers/transformOrdinals.ts b/packages/roosterjs-content-model-plugins/lib/autoFormat/numbers/transformOrdinals.ts
index 49da2c899be..7726b5592b3 100644
--- a/packages/roosterjs-content-model-plugins/lib/autoFormat/numbers/transformOrdinals.ts
+++ b/packages/roosterjs-content-model-plugins/lib/autoFormat/numbers/transformOrdinals.ts
@@ -15,18 +15,22 @@ const getOrdinal = (value: number) => {
 };
 
 /**
- * @internal
+ * The two last characters of ordinal number (st, nd, rd, th)
  */
-export function transformOrdinals(
+const ORDINAL_LENGTH = 2;
+
+/**
+ * @internal
+ */ export function transformOrdinals(
     previousSegment: ContentModelText,
     paragraph: ShallowMutableContentModelParagraph,
     context: FormatContentModelContext
 ): boolean {
     const value = previousSegment.text.split(' ').pop()?.trim();
     if (value) {
-        const ordinal = value.substring(value.length - 2);
-        const ordinalValue = parseInt(value);
-        if (ordinalValue && getOrdinal(ordinalValue) === ordinal) {
+        const ordinal = value.substring(value.length - ORDINAL_LENGTH); // This value  is equal st, nd, rd, th
+        const numericValue = getNumericValue(value); //This is the numeric part. Ex: 10th, numeric value = 10
+        if (numericValue && getOrdinal(numericValue) === ordinal) {
             const ordinalSegment = splitTextSegment(
                 previousSegment,
                 paragraph,
@@ -41,3 +45,12 @@ export function transformOrdinals(
     }
     return false;
 }
+
+function getNumericValue(text: string) {
+    const number = text.substring(0, text.length - ORDINAL_LENGTH);
+    const isNumber = /^-?\d+$/.test(number);
+    if (isNumber) {
+        return parseInt(text);
+    }
+    return null;
+}
diff --git a/packages/roosterjs-content-model-plugins/test/autoFormat/numbers/transformOrdinalsTest.ts b/packages/roosterjs-content-model-plugins/test/autoFormat/numbers/transformOrdinalsTest.ts
index 74ffb14f773..f5ffeda194d 100644
--- a/packages/roosterjs-content-model-plugins/test/autoFormat/numbers/transformOrdinalsTest.ts
+++ b/packages/roosterjs-content-model-plugins/test/autoFormat/numbers/transformOrdinalsTest.ts
@@ -127,4 +127,60 @@ describe('transformOrdinals', () => {
         };
         runTest(segment, paragraph, { canUndoByBackspace: true } as any, false);
     });
+
+    it('word and th', () => {
+        const segment: ContentModelText = {
+            segmentType: 'Text',
+            text: '12-month',
+            format: {},
+        };
+        const paragraph: ContentModelParagraph = {
+            blockType: 'Paragraph',
+            segments: [segment],
+            format: {},
+        };
+        runTest(segment, paragraph, { canUndoByBackspace: true } as any, false);
+    });
+
+    it('word and rd', () => {
+        const segment: ContentModelText = {
+            segmentType: 'Text',
+            text: '13-rd',
+            format: {},
+        };
+        const paragraph: ContentModelParagraph = {
+            blockType: 'Paragraph',
+            segments: [segment],
+            format: {},
+        };
+        runTest(segment, paragraph, { canUndoByBackspace: true } as any, false);
+    });
+
+    it('word and nd', () => {
+        const segment: ContentModelText = {
+            segmentType: 'Text',
+            text: '14-second',
+            format: {},
+        };
+        const paragraph: ContentModelParagraph = {
+            blockType: 'Paragraph',
+            segments: [segment],
+            format: {},
+        };
+        runTest(segment, paragraph, { canUndoByBackspace: true } as any, false);
+    });
+
+    it('large number', () => {
+        const segment: ContentModelText = {
+            segmentType: 'Text',
+            text: '145th',
+            format: {},
+        };
+        const paragraph: ContentModelParagraph = {
+            blockType: 'Paragraph',
+            segments: [segment],
+            format: {},
+        };
+        runTest(segment, paragraph, { canUndoByBackspace: true } as any, true);
+    });
 });