# Subtraction

## Modeling Addition and Subtraction Structures

I am finishing out the school year with my first and second graders by trying to give them a solid foundation with the different structures for addition and subtraction problems….

## Concrete Learning for Subtraction with Regrouping

Earlier in the week, I wrote about the importance of following the concrete, representational, abstract (CRA) sequence for math instruction. One thing I failed to mention is that the types…

## Why CRA?

First, I have a quiz for you. If you speak and write Hindi, you can skip this quiz. For the rest of you, look at the symbols below. Can you…

## Bigger Bottom? How NOT to teach to subtract with regrouping!

Last week I had my first private tutoring session with an adorable 3rd-grade boy. You should know that I’m not a real structured tutor–I kinda like to find a starting…

## Ten Take-Away

My most-viewed post contains a little game called Deal Out a 10. It’s a quick and easy, yet powerful, activity for building an understanding of ten using an ordinary deck…

## Target 20: A Math Game of Strategy and Computation

You can never have too many math games, right? Slip in a little strategy to boost problem-solving and limit the materials to four dice and a recording sheet, and this…

## Who’s Doing the Talking? The Power of Number Talks

So, I’m starting out today with a pop quiz. Ha ha. What do the following number sentences have in common? NO calculators! They all equal 120, don’t they? Do you…

## How Many More? Comparison Subtraction

Comparison subtraction is really tricky for kids. Part of that is a lack of exposure. We typically teach subtraction as take away, and that is certainly one of the subtraction…

## More Mental Math Strategies

After a recent post on addition strategies, I had a reader email me and ask about subtraction strategies. She was working with her daughter on homework, and while she understood…