Subtracting larger numbers in your head is not always easy, so you can use the column method to take one number away from another. You write the larger number above the smaller number, so that the ...

The goats and their friends are having a party, but they need your help to reach the piñata. As a team, use your knowledge of thousands, hundreds, tens and ones place values to help the goats release ...

It took an earthquake to convince one city to do away with a double-decker highway. City planners in San Francisco had tried for years to get approval for removing the Embarcadero Freeway that blocked ...