We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangle left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .

We have  triangles and we want to subtract  triangles, which means the same thing as take them away. We can cross off the  triangles that we are subtracting, and count the number that we have left. In this case we have  triangles left. Subtraction is like counting backwards. We can start at  and count back .