Look at these number bricks.
You'll notice that 5 + 7 = 12 and that A must equal 10, so that 5 + 10 = 15
The same rule applies with algebra bricks.
So here, the values on the two bricks at the bottom will add to give us the value in the brick above them.
To find the total of these two values, we need to gather like terms:
x + 3 + x - 4 = 2x - 1
In this activity, the expression on any brick can be worked out by adding the expressions on the two bricks below it.
Does this make sense?
Don't worry if you feel like the girl in the picture - we'll work through some together to make sure it becomes clear! Let's get started.
View the activity introduction for more information on the topic
Read the question aloud
Open the accessibility toolbar to change fonts and contrast, choose a different language, use a ruler and more
Question
Do you want to skip questions and finish?
Hold up, it looks like there may be an issue with your spelling. Why not try it again?
You need to check your answer before you proceed. Are you sure you want to skip?
Teacher explanation