# Using Base 10 Blocks to Subtract 2 Digit Numbers

Content Using Base 10 Blocks to Subtract 2 Digit Numbers
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## Subtraction using Base Ten Blocks

We can subtract numbers within 100 using base ten blocks along with other numbers, but in this text we are practicing 2 digit subtraction with base ten blocks. We will focus on two-digit numbers subtracting one from the other. That means we will be subtracting the tens place and the ones place of two numbers. How do you use base ten blocks to subtract? Let’s take a look at the example of subtraction with base ten blocks in the next section.

## Subtraction using Base Ten Blocks – Example

They started with forty-eight boxes of pizza, and the sneaky squid took twenty-five. Let's look at this example of column subtraction using base ten and subtract twenty-five from forty-eight to see how many boxes of pizza are left. When subtracting two-digit numbers, we can use base ten blocks on a place value chart to help.

Forty-eight in a place value chart looks like this:

Tens Ones
4 8

Twenty-five in a place value chart looks like this:

Tens Ones
2 5

The first step is to represent how much pizza they started with. Since there is a four in the tens place, we put four tens in the tens place.

There is an eight in the ones place, so we put eight ones in the ones place.

The second step is to subtract twenty-five starting with the ones place, so subtract five from eight. If we take five ones from the ones place, we have three left.

Next, move to the tens place and subtract two TENS from four tens. If we take two TENS from the tens place, we have two left.

Forty-eight minus twenty-five is twenty-three.

## Subtraction using Base Ten Blocks – Summary

When you practise base ten blocks subtraction, follow these steps:

Step # What to do
1 Represent the number you started with
on the place value chart using base ten blocks.
2 Take away blocks, by first subtracting
the ones place and then the tens place.
3 What remains is the answer.

Want some more subtraction with base ten blocks practice? You can find base ten block subtraction worksheets along with interactive base ten block subtraction exercises and further activities also on our website.

### TranscriptUsing Base 10 Blocks to Subtract 2 Digit Numbers

Mr. Squeaks and Imani have been in Italy and are bringing some pizza and lasagne home. Oh no, it looks like this sneaky squid is hungry too!

"Subtracting Two-Digit Numbers Using Base Ten Blocks" They started with forty-eight boxes of pizza, and the sneaky squid took twenty-five. Let's subtract twenty-five from forty-eight to see how many boxes of pizza are left. When subtracting two-digit numbers, we can use base ten blocks on a place value chart to help. The first step is to represent how much pizza they started with. They started with forty-eight boxes, so we'll use base ten blocks to show it on the place value chart. Since there is a four in the tens place, we put four TENS in the tens place. There is an eight in the ones place, so we put eight ONES in the ones place. The second step is to subtract twenty-five starting with the ones place, so subtract five from eight. If we take five ONES from the ones place, we have three left. Next, move to the tens place and subtract two TENS from four tens. If we take two TENS from the tens place, we have two left. Forty-eight minus twenty-five is twenty-three. Mr. Squeaks and Imani have twenty-three boxes of pizza left on the boat. Now let's see how much lasagne they have left.
They started with eighty-six boxes of lasagne, and the sneaky squid took fifty-two, so we need to solve eighty-six minus fifty-two. First, represent eighty-six on the place value chart using base ten blocks. What number is in the tens place? There is an eight in the tens place, so we put eight TENS in the tens place. What number is in the ones place? There is a six in the ones place, so we put six ONES in the ones place. The second step is to subtract fifty-two starting with the ones place, which means we subtract two from six. What is six minus two? If we take two ONES from the ones place, we have four left. Next, we subtract the tens place, which means we subtract five TENS from eight tens. What is eight TENS minus five tens? Three tens, so eighty-six minus fifty-two is thirty-four. Mr. Squeaks and Imani have thirty-four boxes of lasagne left on the boat. Remember, when you subtract using base ten blocks, the first step is to represent the number we started with on the place value chart using base ten blocks. The second step is to take away blocks, by first subtracting the ones place and then the tens place. What remains is the answer. Mr. Squeaks and Imani still have enough pizza and lasagne to enjoy when they get home, but there's just one question: What did the sneaky squid do with all of that food?

## Using Base 10 Blocks to Subtract 2 Digit Numbers exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the video Using Base 10 Blocks to Subtract 2 Digit Numbers.
• ### Can you order the steps to subtract two digit numbers?

Hints

If we were solving this subtraction number sentence, we would start like this.

After taking away the ones, you would be left with this.

This is what we would be left with.

Solution
1. First, represent the number we are starting with on a place value chart using base ten blocks.
2. Take away the ones.
3. Take away the tens.
4. What remains is our answer.
• ### How many gelato cones do Mr. Squeaks and Imani have left?

Hints

Look at the base ten in the picture. How many ones would be left after subtracting?

Look at the base ten in the picture. How many tens would be left after subtracting?

This is what it would look like if we remove 3 tens and 3 ones.

Solution

Mr. Squeaks and Imani have 25 gelato cones left.

• ### Which box should Mr. Squeaks put the t-shirts in?

Hints

How many t-shirts did Mr. Squeaks buy? This is your starting number.

How many t-shirts did Mr. Squeaks donate? This is the number you are subtracting.

Solution

Mr. Squeaks has 45 t-shirts left, so they should go in this box.

87 - 42 = 45

• ### Can you find the answers to the subtraction problems?

Hints

Remember the steps to solve the problem.

Begin by representing the first number using base ten blocks.

Here is an example of base ten blocks. You could draw some out using a line for a ten and a dot for a one.

Remember to subtract the ones and then subtract the tens.

Solution
• 86 - 64 = 22
• 95 - 44 = 51
• 74 - 51 = 23
• 53 - 12 = 41
• 65 - 34 = 31
• ### How many ciabattas are left?

Hints

We started with 7 ones and have taken 4 away. How many ones are left?

We started with 6 tens and have taken 2 away. How many tens are left?

Solution

Mr. Squeaks and Imani have 43 ciabattas left.

• ### Mr Squeaks' trip to France.

Hints

Look through each passage and find the key information. How many food items did Mr. Squeaks start with each time? This is the number you need to start with.

How many food items were taken away or dropped? This is the number you are subtracting.

Here is an example of base ten blocks. You could draw some out using a line for a ten and a dot for a one.

Solution

Mr. Squeaks is so excited to be in France! He went to the bakery and bought 28 croissants. He was walking by the river when suddenly, out popped the sneaky squid! The squid took 17 croissants! Now Mr. Squeaks has 11 croissants left.

Mr. Squeaks went back to the bakery and bought 47 baguettes. He riskily decided to walk back along the river again, but that sneaky squid came back! The squid took 26 baguettes so now Mr. Squeaks only has 21.

Mr. Squeaks hurried on but stopped at a crêperie. He bought 56 crêpes but would you believe it, the sneaky squid popped up in the river beside him and took 34! Now Mr. Squeaks has 22 crêpes.

Mr. Squeaks couldn't believe it! He sighed and walked on and went past a restaurant. He went in and ordered 84 pieces of cheese! As the waiter was bringing them over, he dropped 52 pieces on the floor! Mr. Squeaks only got 32 pieces of cheese! And it wasn't even the sneaky squid that time!