Let’s Learn!

Think About It!

Goal: Identify the hundreds place.

Casey and Landon had a total of 800 toy cars. Landon took 300 cars home. How many toy cars are left?

Slide: 1 / 6

We can help Casey and Landon by subtracting 300 from 800. 800 is the whole, and 300 is the part. Our first step is to stack these numbers.

Now that the whole and part are stacked, let’s add a subtraction sign and a line.

800

300

Great job! The digits in the ones and tens places are zeros. Try ignoring these digits to make subtraction easier!

	800
-	300

Now it is time to subtract the digits in the hundreds place. What is 8 - 3?

	800
-	300

We already know that 0 - 0 = 0, so write the zeros in the difference.

	800
-	300
	5

See how easy it is to subtract hundreds when we ignore the zeros? This is a mental math strategy. Mental math is math that you do in your head, without paper or pencil. Let’s check our work on a thousand chart. A thousand chart lists numbers from 10 to 1,000 in multiples of ten.

Thousands chart with 800 highlighted and three arrows labeled '- 100' jumping to 500.

700 - 200 = 500 because 7 - 2 = 5.

Yes! 700 - 200 = 500 because 7 - 2 = 5.

Questions answered correctly:

Questions answered incorrectly:

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Let’s Learn!

Where is the hundreds place?

Think About It!

1. What is 700 - 200?

Summary