# Lesson Video: Recognizing and Counting Money: Piastres Mathematics

In this video, we will learn how to recognize and tell the value of all the coins used in Egypt, count to find the value of a group of coins in piastres, and find different ways to make one pound.

11:55

### Video Transcript

Recognizing and Counting Money: Piastres

In this video, we’re going to learn how to recognize the coins used in Egypt and say their value. We’re also going to learn how to count a group of coins to find their value in piastres, and we’re going to learn how to find different ways to make one pound.

These are the three Egyptian coins we’re going to be learning about. Let’s look more closely at each coin. Did you notice that the first coin is the biggest? Do you know why? It’s because this coin is worth the most. This is one pound. We know this because the value of each coin is written on it. It says one pound in English and the number one written in Arabic. We would write this as one LE. One Egyptian pound or one pound is worth 100 piastres.

Let’s look more closely at the second coin. This coin is worth 50 piastres. It’s smaller than a one-pound coin because it’s worth less. 50 piastres is half of a pound. We know there are 100 piastres in one pound, so half a pound is 50 piastres. We could use two 50-piastre coins to make one pound. This is the smallest of our three coins because it’s worth the least. This coin is worth 25 piastres. We can see it’s written as 25 PT. Piastres has been shortened to PT. 25 piastres is a quarter of one pound. There are four 25s in 100.

Now that we’ve learned about each of the three coins and their value, let’s think about different ways to make one pound. The easiest way to make one pound is to use a one-pound coin. And we know that one pound is worth 100 piastres. Here’s another way to make a pound. We know that each 50-piastre coin is worth half a pound, and we know that two 50s make 100, so two 50-piastre coins equal one pound. Here’s another way to make a pound. 50 plus 25 plus 25 equals 100. And we know there are 100 piastres in one pound. Two 25 piastres make 50 piastres. 50 plus 50 equals 100 piastres.

There’s one more way that we could make a pound. Do you know what it is? Each 25-piastre coin is worth a quarter of a pound. Four-quarters equals one whole or one pound, so we could use four 25-piastre coins to make one pound. We found four different ways to make one pound. We could use a one-pound coin. We know a 50-piastre coin is worth half a pound, so we would need two to make one pound. Two 25-piastre coins make 50. 50 plus 50 makes 100 piastres. So we could use a 50- and two 25-piastre coins to make one pound. We know that a 25-piastre coin is worth a quarter of a pound. Four-quarters makes one whole or one pound, so we need four 25-piastre coins to make a pound.

Now that we’ve learned how to recognize Egyptian coins and their value and we know different ways to make one pound, let’s practice with some questions.

Complete.

In this question, we’re shown three different coins. We have to add them together to find the total number of piastres. We could use a number line to help. And we’re counting in piastres. We know this one-pound coin is worth 100 piastres. Our next coin is worth 50 piastres. So we need to start at 100 on our number line and count forward 50 more. 100 plus 50 is 150 piastres. Now we just need to add our final coin which is worth 25 piastres. 150 plus 25 equals 175 piastres. One pound plus 50 piastres plus 25 piastres equals 175 piastres.

Which of the following represents 50 piastres?

In this question, we’re shown four different groups of coins. We have to find the total value of each group of coins and select the group which represents 50 piastres. Let’s add together the value of the two coins in the first group. We could use this part–whole model to help. If the total amount of piastres we’re trying to make is 50 and our first coin is worth 50 piastres, it can’t be this group of coins because our second coin is worth 25 piastres. 50 plus 25 gives us more than 50. 50 and 25 is 75.

It can’t be this group of coins either because 50 plus 25 plus 25 is greater than 50. We can’t use two 50-piastre coins to make 50 piastres because double 50 is 100. So it must be our final group of coins. There are two 25-piastre coins. 25 doubled or 25 plus 25 does equal 50. This is the group of coins which represents 50 piastres. 25 plus 25 equals 50.

Which of the following represents 100 piastres? Is it 50 piastres plus 25 piastres plus 25 piastres? One pound plus 50 piastres. Is it one pound plus 25 piastres plus 25 piastres? Or is it 25 piastres plus 25 piastres plus 25 piastres?

In this question, we have to find the group of coins which represents 100 piastres. We could use this bar model to help. We know the whole amount or the amount we’re looking to make is 100 piastres. We have a coin worth 50 piastres and two 25s. We know that double 25 is 50 and double 50 equals 100. 50 plus 25 plus 25 equals 100 piastres. These coins represent 100 piastres. If we have a one-pound coin and a 50-piastres coin, we’ve got more than 100 piastres because the one-pound coin is worth 100 piastres. 100 plus 50 is 150.

This group of coins also represents 150 piastres. 100 plus 25 plus 25 equals 150. And the total of our three 25-piastre coins is 75. 25 plus 25 plus 25 equals 75. This is the group of coins which represents 100 piastres.

Complete.

In this question, we have to add together these three amounts of coins to find the total number of piastres. There are two one-pound coins. We know that one pound is worth 100 piastres, so two pound coins are worth 200 piastres. Next, we need to add our three 50-piastre coins. 50 plus 50 is 100. 100 plus 50 is 150. Now we need to add all three 25-piastre coins. 25 plus 25 is 50. 50 plus 25 is 75.

Let’s use a number line to help us add 200, 150, and 75. 200 plus 100 takes us to 300, and 50 more takes us to 350. We’ve added our first two groups of coins. Now what we need to do is add 75. Let’s partition our 75 into 50 and 25. 50 more than 350 is 400. Now we just need to add our 25. 400 plus 25 takes us to 425. If we add together two one-pound coins plus three 50-piastre coins plus three 25-piastre coins, the total number of piastres is 425.

What have we learned in this video? We’ve learned how to recognize Egyptian coins. We’ve learned the value of each coin and how to use different coins to make one pound.