The common-core math standards require that students learn the standard algorithm for multi-digit adding and subtracting—you know, the process in which you line the numbers up vertically to add or ...

This is a preview. Log in through your library . Abstract Conceptually based instruction on place value and two-digit addition and subtraction without regrouping was provided in four first-grade ...

The Common Core math standards are a topic of hot controversy, especially on the right. The Daily Signal, a news and commentary site started by the Heritage Foundation, recently featured this picture ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Hello learners. My name's Miss White and I'm very excited to be teaching you today. For this lesson you ...

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 present paper describes the success, the methods (mental, informal written, standard algorithm) and the strategies of informal written arithmetic to be observed when 300 elementary students worked ...