Isabella has shown two ways to subtract from four. Four take away three equals one. And four take away two equals two. Find another way to take away from four. What number is missing? Four take away one equals something.
In this problem, Isabella starts off with four counters every time. The pictures show how she removes different counters each time to subtract or take away different numbers from four. Can you see how they’ve been crossed out.
In the first calculation, we can see that Isabella has started off with four counters and taken away three. How many counters does she have left? Four take away three equals one. In the next example, Isabella starts off with four counters again. It’s at this time she decides to subtract two. And so this time, she removes two counters. How many are left? We can see that four take away two equals two.
And so our problem now asks us to find another way to take away from four. We can see from the picture and also from the number sentence underneath that this time, we’re being asked to take away one. So just like Isabella, we’ll start with four counters. We’ll remove or take away one of them. How many are left? One, two, three. And so our missing number is three. Four take away one equals three.
So far, we’ve found three ways to take away from four. Let’s find another way to subtract from four. What number is missing this time? This time, the picture shows the four counters that we’ve started with. And none have been taken away. Four take away zero, how many are left? Well, if we don’t take any away, we’re still left with the number we started with. Four take away zero equals four. Now there is one more amount of counters we can take away.
Find another way to subtract from four. Write the equation.
This time, we can see from the picture that although we’ve started with four counters, all four counters have been taken away. And if we remove all of our counters, how many are left? There aren’t any counters left. Four take away four equals zero. And so our equation or number sentence can be written like this.
By answering this question, we found five different ways to subtract from four.