# Subtraction

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This section includes free printable worksheets, tables and flashcards for practicing subtraction with whole numbers. As with the Addition section, there are also online flashcards that randomly ask subtraction questions.

Use the links above or the menu options at the top to select the resources that you need.

### Subtracting with regrouping

Help your child to understand the concept of regrouping when subtracting numbers. Work through the illustrated example to help with this.

#### Recap: Base Ten Number Systems

We use the base ten number system to write numbers with each place having a value; ones, tens, hundreds, thousands, and so on.

When subtracting numbers we often have to split-up these groups to help us to do the subtraction. The example below shows this.

Start with the ones. 2 - 7 can't be done. We're trying to take away more ones than we have. We need more ones!

Let's take 1 of our tens and split it into 10 ones. We've now got 12 ones. We've also got 1 less ten.

We can now do the subtraction:
12 - 7 = 5 ones
3 - 2 = 1 ten

### Common error when subtracting

As shown in the example below, when there is a need to regroup, some students take the easy and incorrect option and simply subtract the smaller digit from the larger digit.

This is a common error, especially when subtracting from multiples of 10 as shown above. Use this worksheet generator to set up lots of this type of question to provide practice with subtracting from multiples of 10.

### Subtracting Across Zeros

When students regroup they often find difficulty when "the neighbor is zero" and there appears to be nothing to regroup. This difficulty can be overcome by building on their understanding of place value. For example, the number 600 can be seen as zero 1s, zero 10s, and six 100s but it can also be seen as zero 1s and sixty 10s. This understanding, together with the boxing-off method shown in the examples below, will help your children when subtracting across zeros.

#### Example 2

You will find a good video on subtracting across zeros here .

This worksheet generator to can be set up to provide limitless practice questions with subtracting from multiples of hundreds.

### Subtraction Games

You will find some subtraction games here alongside some games on addition as well.

### Help with Subtraction

The National Library of Virtual Manipulatives has many excellent resources including these Base Blocks Subtraction that you and your child can work with to help grasp the concept of whole number subtraction, including regrouping, with the base-ten number system. Read the instructions carefully to ensure you get maximum benefit from these very good resources.

Note: If you are an educator and would like to use these online flashcards on your site, then you are free to get them from the HelpingWithMath.com Download Place.

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