Pirate Treasure Quest: Unlock the Secrets of Subtraction

Lesson Plan - Get It!

Audio:

Get ready to find hidden treasures by solving subtraction problems under 20!

You can choose the best strategy to solve each problem, like using a tape diagram or a number line.

• Are you ready to start your adventure and unlock the missing treasures?

Begin with how to use a tape diagram to subtract.

Sail the Sea Using a Tape Diagram.

Imagine you're on a pirate boat with Captain Numbers.

You see 12 fish swimming in the ocean.

Then, 5 fish swim away from the group!

Captain Numbers needs your help to find out how many fish are still swimming.

Here's how to help.

Look at this tape diagram. Each green block represents the 12 fish you saw swimming in the ocean.

Now, look at this tape diagram.

• Do you see the 5 red blocks?

These represent the 5 fish that swim away.

Now, count the leftover green blocks.

• How many green blocks are left?

Wow! That's right, 7.

So, that means 7 fish are still swimming.

If 5 fish left the group of 12, there are 7 fish still swimming.

Great job, pirate! You helped Captain Numbers find out how many fish are still swimming.

This trick helps you figure out how many things are left after subtracting, which is super helpful in real life, too!

It helps you see how many of your favorite books are still on the shelf or how many crayons are left in the box.

• Are you ready to give it a try?

You have 14 strawberries, and you eat 6 of them.

• How many strawberries do you have left?

Use the tape diagram below to answer the question.

Woo-hoo, you did it!

• Did you know using a number line is another easy way to subtract numbers?

Watch this video to learn how to take away using a number line.

Now, you can use a number line to subtract.

By counting back from a bigger number, you can easily find out how many are left.

This helps you solve problems super fast.

Number Line With Seahorses

Imagine you're sailing across the high seas of numbers.

Captain Numbers sees a group of 15 seahorses swimming.

Then, 5 of the seahorses swim away!

Captain Numbers needs your help to find out how many seahorses are still swimming.

Use the number line below to find out how many seahorses are left.

Look at your pirate ship on the number line. It starts at the number 15.

Then, it sails back 5 spots.

• Which number did your pirate ship land on?

Woo-hoo! Great job. You landed on the number 10.

You helped Captain Numbers find out how many seahorses are still swimming.

Using a number line helps you see how numbers go down step by step.

It makes it easy to learn how numbers work.

• Are you ready to practice?

Use your pirate ship on these number lines to answer the following questions.

Wow! You did such a great job.

Congratulations! You helped Captain Numbers find the missing numbers by solving subtraction puzzles under 20.

Now, sail to the Got It? section to test your new skills!