diff --git a/packages/math/src/decimal.spec.ts b/packages/math/src/decimal.spec.ts
index b0e1803b..b59e556b 100644
--- a/packages/math/src/decimal.spec.ts
+++ b/packages/math/src/decimal.spec.ts
@@ -211,6 +211,47 @@ describe("Decimal", () => {
     });
   });
 
+  describe("multiply", () => {
+    it("returns correct values", () => {
+      const zero = Decimal.fromUserInput("0", 5);
+      expect(zero.multiply(Decimal.fromUserInput("0", 5)).toString()).toEqual("0");
+      expect(zero.multiply(Decimal.fromUserInput("1", 5)).toString()).toEqual("0");
+      expect(zero.multiply(Decimal.fromUserInput("2", 5)).toString()).toEqual("0");
+      expect(zero.multiply(Decimal.fromUserInput("2.8", 5)).toString()).toEqual("0");
+      expect(zero.multiply(Decimal.fromUserInput("0.12345", 5)).toString()).toEqual("0");
+
+      const one = Decimal.fromUserInput("1", 5);
+      expect(one.multiply(Decimal.fromUserInput("0", 5)).toString()).toEqual("0");
+      expect(one.multiply(Decimal.fromUserInput("1", 5)).toString()).toEqual("1");
+      expect(one.multiply(Decimal.fromUserInput("2", 5)).toString()).toEqual("2");
+      expect(one.multiply(Decimal.fromUserInput("2.8", 5)).toString()).toEqual("2.8");
+      expect(one.multiply(Decimal.fromUserInput("0.12345", 5)).toString()).toEqual("0.12345");
+
+      const oneDotFive = Decimal.fromUserInput("1.5", 5);
+      expect(oneDotFive.multiply(Decimal.fromUserInput("0", 5)).toString()).toEqual("0");
+      expect(oneDotFive.multiply(Decimal.fromUserInput("1", 5)).toString()).toEqual("1.5");
+      expect(oneDotFive.multiply(Decimal.fromUserInput("2", 5)).toString()).toEqual("3");
+      expect(oneDotFive.multiply(Decimal.fromUserInput("2.8", 5)).toString()).toEqual("4.2");
+      expect(oneDotFive.multiply(Decimal.fromUserInput("0.12345", 5)).toString()).toEqual("0.18517");
+
+      // original value remain unchanged
+      expect(zero.toString()).toEqual("0");
+      expect(one.toString()).toEqual("1");
+      expect(oneDotFive.toString()).toEqual("1.5");
+    });
+
+    it("throws for different fractional digits", () => {
+      const zero = Decimal.fromUserInput("0", 5);
+      expect(() => zero.multiply(Decimal.fromUserInput("1", 1))).toThrowError(/do not match/i);
+      expect(() => zero.multiply(Decimal.fromUserInput("1", 2))).toThrowError(/do not match/i);
+      expect(() => zero.multiply(Decimal.fromUserInput("1", 3))).toThrowError(/do not match/i);
+      expect(() => zero.multiply(Decimal.fromUserInput("1", 4))).toThrowError(/do not match/i);
+
+      expect(() => zero.multiply(Decimal.fromUserInput("1", 6))).toThrowError(/do not match/i);
+      expect(() => zero.multiply(Decimal.fromUserInput("1", 7))).toThrowError(/do not match/i);
+    });
+  });
+
   describe("equals", () => {
     it("returns correct values", () => {
       const zero = Decimal.fromUserInput("0", 5);
diff --git a/packages/math/src/decimal.ts b/packages/math/src/decimal.ts
index ffedd0ed..969f811c 100644
--- a/packages/math/src/decimal.ts
+++ b/packages/math/src/decimal.ts
@@ -124,6 +124,18 @@ export class Decimal {
     return new Decimal(sum.toString(), this.fractionalDigits);
   }
 
+  /**
+   * a.multiply(b) returns a*b.
+   *
+   * Both values need to have the same fractional digits.
+   */
+  public multiply(b: Decimal): Decimal {
+    if (this.fractionalDigits !== b.fractionalDigits) throw new Error("Fractional digits do not match");
+    const factor = new BN(10).pow(new BN(this.data.fractionalDigits));
+    const product = this.data.atomics.mul(new BN(b.atomics)).div(factor);
+    return new Decimal(product.toString(), this.fractionalDigits);
+  }
+
   public equals(b: Decimal): boolean {
     return Decimal.compare(this, b) === 0;
   }
diff --git a/packages/math/types/decimal.d.ts b/packages/math/types/decimal.d.ts
index 0642fa07..102498d4 100644
--- a/packages/math/types/decimal.d.ts
+++ b/packages/math/types/decimal.d.ts
@@ -24,6 +24,12 @@ export declare class Decimal {
    * Both values need to have the same fractional digits.
    */
   plus(b: Decimal): Decimal;
+  /**
+   * a.multiply(b) returns a*b.
+   *
+   * Both values need to have the same fractional digits.
+   */
+  multiply(b: Decimal): Decimal;
   equals(b: Decimal): boolean;
   isLessThan(b: Decimal): boolean;
   isLessThanOrEqual(b: Decimal): boolean;