Date: <input data-bind="value: dateValue"/>
Number: <input data-bind="value: dateValue"/>
Result : <span data-bind="text: calculatedValue">Result Should shown here</span>

cy.get("targetDateInput").clear().type("07/08/2018").type("{enter}");
cy.get("targetNumberInput").clear().type("6").type("{enter}");

cy.get("targetCalculatedValueDiv").children("span").should(($span) => {
    expect($span[0].innerHTML).to.contain("07/14/2018");
});