diff --git a/src/lib/index.ts b/src/lib/index.ts
index 4dd6004..8b5e72e 100644
--- a/src/lib/index.ts
+++ b/src/lib/index.ts
@@ -62,7 +62,7 @@ export function add(
  * Multiply arguments, element-wise.
  */
 export function multiply(
-  a: ArbDimNumArray | NdArray,
+  a: ArbDimNumArray | NdArray | number,
   b: ArbDimNumArray | NdArray | number
 ): NdArray {
   return NdArray.new(a).multiply(b);
@@ -72,7 +72,7 @@ export function multiply(
  * Divide `a` by `b`, element-wise.
  */
 export function divide(
-  a: ArbDimNumArray | NdArray,
+  a: ArbDimNumArray | NdArray | number,
   b: ArbDimNumArray | NdArray | number
 ) {
   return NdArray.new(a).divide(b);
diff --git a/test/mocha/divide.spec.ts b/test/mocha/divide.spec.ts
index 747c8bd..f5774f0 100644
--- a/test/mocha/divide.spec.ts
+++ b/test/mocha/divide.spec.ts
@@ -39,4 +39,11 @@ describe('divide', function () {
       nj.divide(x1, x2);
     }).to.throw();
   });
+  it('can set a number to the argument', function () {
+    const a = 2;
+    const b = 3;
+    const numberResult = nj.divide(a, b);
+    const arrayResult = nj.divide(nj.array([a]), nj.array([b]));
+    expect(numberResult).to.eql(arrayResult);
+  });
 });
diff --git a/test/mocha/multiply.spec.ts b/test/mocha/multiply.spec.ts
index a7c9a4c..d590697 100644
--- a/test/mocha/multiply.spec.ts
+++ b/test/mocha/multiply.spec.ts
@@ -44,4 +44,11 @@ describe('multiply', function () {
       nj.multiply(x1, x2);
     }).to.throw();
   });
+  it('can set a number to the argument', function () {
+    const a = 2;
+    const b = 3;
+    const numberResult = nj.multiply(a, b);
+    const arrayResult = nj.multiply(nj.array([a]), nj.array([b]));
+    expect(numberResult).to.eql(arrayResult);
+  });
 });