Multiple digit addition is the last step in my whole number section. Before continuing be sure your child is comfortable with the following.

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## Use Base 10 Blocks to teach Double Digit Addition

Base 10 Blocks are a wonderful tool to teach your child multiple digit addition where 'carry over' exists. If you are not familiar with this manipulative, or just don't own them, you can go here to learn about them, and to access a free printable template to create your own.

### The only Rule of Base 10 Blocks

You can NEVER have 10 or more of any one type of block.  If I do, I must trade 10 of the smaller block for 1 of the next size up.

That's it!  Your child must know this and understand it, and the following information should make this clear to you.  Once your child gets the hang of this - multiple digit addition will never be a problem again!

## Multiple Digit Addition - Worked Example

To proceed with this example you will need my  Multiple Digit Addition Template.

## 9 + 13

 Step 1: Just as with the grouping method of addition, count out 9 squares and place them in the units box on Line 1 of the addition template. Step 2: Count out 13 Squares and place them in the units box on Line 2 of the template. Step 3: Ask the question!Do you have ten or more of any type of block in any box?Answer - YES. (There are 13 squares in Line 2)

And that is it.  The trade up, is what traditionally was called 'carry over'. This may seem like a long winded way to explain addition, however I can almost guarantee that once your child is adding this way, no addition problem will give them trouble ever again.

You will most likely also find, that your child will start 'skipping steps', especially those where the 'trade up' is required.  When they are placing the units, they will start to place them in the 10's and units section, rather than placing them all in the units section originally - you want this to happen, so don't correct them when they start doing this!

## What's Next?

Ensure your child gets a lot of practice with this method, and it will soon become second nature.  Print off my Multiple Digit Addition Worksheets,  which correspond with the addition template, and watch, as your child becomes an adding machine!

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