BBC

Subtraction with up to 4-digit numbers

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 ...
PBS

Add and Subtract 3-Digit Numbers

Add and subtract three-digit numbers with Springling and Minni and Subbi. Join Mrs. McCartney for a Number Talk with D.C. and Value Pak. We'll add and subtract three-digit numbers with Springling and ...
PBS

Subtract a 1-Digit from a 2-Digit Number

Adjust the colors to reduce glare and give your eyes a break. Use one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS ...
Education Week

Should ‘Regrouping’ Be Taught Earlier Under Common-Core Math Standards?

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 ...
JSTOR Daily

Children's Conceptual Structures for Multidigit Numbers and Methods of Multidigit Addition and Subtraction

Karen C. Fuson, Diana Wearne, James C. Hiebert, Hanlie G. Murray, Pieter G. Human, Alwyn I. Olivier, Thomas P. Carpenter and Elizabeth Fennema Researchers from 4 projects with a problem-solving ...