In this video, I explain how to perform two-digit operations quickly using mental strategies. We'll cover **addition**, ...

Add Yahoo as a preferred source to see more of our stories on Google. Math shouldn’t be harder than finding the last matching sock in your laundry. These clever shortcuts convert head-scratching ...

Multiply by 6 using the grouping of objects, arrays, and facts you already know. Explore the Multiply by 6 facts using the grouping of objects and arrays. Compete against characters to see who finds ...