You can find the difference between two numbers in more than one way. You can count up from the smaller number to the larger number. Or, you can count back from the larger number to the smaller number ...

Join Ralph van Dijk and side-kick Matrix for more questions to consolidate mental maths skills. The focus today is adding and subtracting two-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 ...

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

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 ...