diff --git a/.changeset/ninety-bobcats-switch.md b/.changeset/ninety-bobcats-switch.md
new file mode 100644
index 00000000..b72ae7cf
--- /dev/null
+++ b/.changeset/ninety-bobcats-switch.md
@@ -0,0 +1,5 @@
+---
+"@nft-team/core": minor
+---
+
+refactor(@nft-team/core): 유틸함수 변수명 변경 (`removeNullable`, `checkNumber`)
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index e22ae112..e313f9a9 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -1,4 +1,4 @@
 export {
-  checkEmpty, checkNull, checkNumNull, emptyAThenB, generateArrayOfNumber,
-  isEmpty, trueOrFalse,
+  checkEmpty, checkNumber, emptyAThenB, generateArrayOfNumber,
+  isEmpty, removeNullable, trueOrFalse,
 } from './utils';
diff --git a/packages/core/src/utils.test.ts b/packages/core/src/utils.test.ts
index 0a60d2e2..ff6cef7e 100644
--- a/packages/core/src/utils.test.ts
+++ b/packages/core/src/utils.test.ts
@@ -1,18 +1,18 @@
 import {
   checkEmpty,
-  checkNull,
-  checkNumNull,
+  checkNumber,
   emptyAThenB,
   generateArrayOfNumber,
   isEmpty,
+  removeNullable,
   trueOrFalse,
 } from './utils';
 
-describe('checkNull', () => {
+describe('removeNullable', () => {
   context('value가 null일 경우', () => {
     context('replacementValue가 존재하지 않는 경우', () => {
       it('빈 문자열을 반환해야만 한다', () => {
-        const result = checkNull(null);
+        const result = removeNullable(null);
 
         expect(result).toBe('');
       });
@@ -20,7 +20,7 @@ describe('checkNull', () => {
 
     context('replacementValue가 존재하는 경우', () => {
       it('대체할 문자열(두 번째 인자)을 반환해야만 한다', () => {
-        const result = checkNull(undefined, '-');
+        const result = removeNullable(undefined, '-');
 
         expect(result).toBe('-');
       });
@@ -29,17 +29,17 @@ describe('checkNull', () => {
 
   context('value가 null이 아닌 경우', () => {
     it('입력된 값이 반환되어야만 한다', () => {
-      const result = checkNull('nana');
+      const result = removeNullable('nana');
 
       expect(result).toBe('nana');
     });
   });
 });
 
-describe('checkNumNull', () => {
+describe('checkNumber', () => {
   context('value가 null인 경우', () => {
     it('0을 반환해야 한다', () => {
-      const result = checkNumNull(0);
+      const result = checkNumber(null);
 
       expect(result).toBe(0);
     });
@@ -47,7 +47,7 @@ describe('checkNumNull', () => {
 
   context('value가 null이 아닌 경우', () => {
     it('입력된 값이 반환되어야 한다', () => {
-      const result = checkNumNull(100);
+      const result = checkNumber(100);
 
       expect(result).toBe(100);
     });
diff --git a/packages/core/src/utils.ts b/packages/core/src/utils.ts
index ff8517b5..2345bdb1 100644
--- a/packages/core/src/utils.ts
+++ b/packages/core/src/utils.ts
@@ -1,4 +1,4 @@
-export const checkNull = (value?: string | null, replacementValue?: string): string => {
+export const removeNullable = (value?: string | null, replacementValue?: string): string => {
   if (value) {
     return value;
   }
@@ -10,12 +10,12 @@ export const checkNull = (value?: string | null, replacementValue?: string): str
   return '';
 };
 
-export const checkNumNull = (value?: number | null): number => {
-  if (!value) {
-    return 0;
+export const checkNumber = (value?: number | null): number => {
+  if (typeof value === 'number') {
+    return value;
   }
 
-  return value;
+  return 0;
 };
 
 export const emptyAThenB = (b: string, a?: string | null): string => a || b;