Algebra - Expressions 1
If I have x pencils and you have twice as many, how many pencils have you got?

Algebra - Expressions 1

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In Algebra, you can think of an expression as one or a number of mathematical symbols that represent a number or quantity. Expressions can contain any number of numbers, letters and symbols.

See how well you can express yourself by playing this quiz on Expressions!

Simplify 5a + 7a.
Let us suppose that a = 3. (5 x 3) + (7 x 3) = 36. This is the same as saying 12 x 3 (12a) = 36
Which of the following is not a mathematical expression?
6a x 14
5a - 4b +16c x 8d
Oh my gosh!
The correct answer might well be an English expression but it is NOT a mathematical one!
Jane is c years old and her sister Katie is three years younger so how old is Katie?
c + 3
c - 3
c - 3 - 3
In an algebraic expression letters are often used to represent what?
Other letters
Only numbers greater than 1
Only numbers less than 1
A letter can be used in place of any number - especially if the number has not yet been worked out
Which of these is a simplification of 2a x 3a?
You must multiply the numbers together AND the letters. Remember a x a = a2
Suzie is x years old and she has a sister called Rosie who is four years older. Rosie's mother was 28 when Rosie was born. How old is Rosie's mother now?
x + 28
x - 4
x + 32
If you got the answer wrong then think carefully through each aspect of the question. Rosie's mother was 28 when Rosie was born. 4 years later, Suzie was born. Suzie is now x years old so Rosie's mother's age is now
28 + 4 + x = 32 + x
Simplify 4a + 5b + 6b + 11a
15a2 + 11b2
15a + 11b
9a + 17b
Here we are adding numbers together, NOT multiplying them together
What is the simplification of 3a + 4b + 6c + 3a - 6c - a - 3b?
4a + 2b - 3c
5a + b
6a - 3b
9a - 2b - c
Be careful to account for all the a's, then all the b's and then all the c's. In this case + 6c and - 6c cancel each other out and therefore they do not appear in the simplification
Peter has x brothers, Paul has y brothers and Graham has z brothers. Between the three boys, how many brothers have they got?
x + y + z
x + y - z
x - y + z
Don't get baffled by complicated wording - often the answer is easier than you think
If I have x rabbits and you have twice as many, how many rabbits have you got?
2 + x
2 - x
You have two times the number that I have got and 2 times x is the same as 2x
Author:  Frank Evans

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