IXL | Word problems with change unknown - up to 20

Read the story.

Tom had a string with 16 beads on it. Some of the beads fell off, and now there are 10 beads left. How many beads fell off?

Pick the model that matches the story.

How many beads fell off?

beads

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Learn with an example

Read the story.

There were 8 pencils in a cup. Then, Ms. Jackson added some more. Now there are 18 pencils in the cup. How many pencils did Ms. Jackson add?

Pick the model that matches the story.

How many pencils did Ms. Jackson add?

pencils

There were 8 pencils in a cup, and Ms. Jackson added some more. Now there are 18 pencils in the cup. This model matches the story.

pencils now

pencils to start

pencils added

Now, find the missing number. The model shows you can use addition or subtraction.

You can write an addition sentence and find the missing number.

Or you can use the related subtraction sentence.

–

Ms. Jackson added 10

pencils.

Looking for more? Try this:

$Confetti$

Now entering the Challenge Zone—are you ready?

hr	min	sec
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Teacher tools

Work it out

Not feeling ready yet? These can help: