Adding tens and hundreds

Adding tens and hundreds

using place value

Multiple Select

What number comes next in the patterns?

160, 170, 180, _____

200, 300, 400, _____

• 190

• 200

• 500

• 600

What did you notice?

the first pattern was counting by tens and the second pattern was counting by hundreds. We are going to use place value to help us add by tens and hundreds today!

250 + 10 =

Let's practice adding by ten first.

I want to add 250 + 10 = _

First, you use your flats and rods to represent the number 250.

Here is the number 250 modeled using flats and rods. There are 2 hundreds, 5 tens, and 0 ones.

250 + 10 =

Now that we modeled 250 using flats and rods let's add 10 more. When we add 10 to a number we are only adding 1 ten to the tens place. 5 tens plus 1 ten equals 6 tens. 250 + 10 = 260.

Multiple Choice

Your turn to try!

230 + 10 = ___

• 330

• 240

222 + 100 =

Now we are going to practice adding a hundred.

I want to add 222 + 100 =

First use your flats, rods and units to represent 222.

There are 2 hundreds, 2 tens, and 2 ones. We are adding 100 to 222. This means we only need to add 1 hundred to the number in the hundreds place. The numbers in the tens and ones place will stay the same

222 + 100 =

Now that we modeled 222 using the flats, rods and units, let's add 100 more.

We have added a flat, or 100, to the number 222. We added 0 ones, so the ones place stays the same. We added 0 tens, so the tens place stays the same. We added 1 hundred to the hundreds place, so 2 + 1 = 3. Adding 1 to the hundreds place gives us 322.

So, 222 + 100 = 322.

Multiple Choice

Your turn to try!

734 + 100 =

• 834

• 744

We're going to practice adding by tens and hundreds a few more times . . .

.

Multiple Choice

Add to find the sum

10 + 845 =

• 855

• 945

Multiple Select

Add to find the sum

100 + 443 = 543

• True

• False

Multiple Choice

Carlos helped his friend Ryan bake cookies for a bake sale. They baked 52 cookies in the morning. By the end of the day they baked 152 cookies. Did they bake 10 more or 100 more?

• 10 more

• 100 more

Multiple Choice

Sabrina went to the park with her aunt. When they walked in into the park they counted 127 pigeons in a tree. When they were leaving they counted 137 pigeons in the same tree. Did they count 10 more or 100 more pigeons?

• 10 more

• 100 more

You can add by tens and hundreds now!

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