Algebraic expressions
1. Write using algebraic expression:
a) a number which is 2 times bigger than n:
b) a number which is 7 less than n;
c) a number which is 4 times smaller than n;
d) a number which is 5 times bigger than x squared;
e) x cubed;
f) a number which is 20% bigger than x;
g) a number which is 3 times smaller than the sum of number x and y;
h) a number which is 7 less than x cubed;
i) y squared;
j) the sum of number x and the number 8 bigger than x;
k) the number which is 3 times bigger than the sum of n and k;
l) the product of a, b and c.
2. There are x cars and y bicycles in the car park. How many wheels are there in this car park?
One car left the car park. How many wheels are there now? Write using the right algebraic
expression.
3. Ross is x years old and is 5 years older than Mark and 3 times younger than Philip. How
old is Mark and how old is Philip? How old was Ross when Mark was born.
4. A taxi driver charges passengers £1 plus 50p per mile. Write down a formula for the cost of
travelling x miles.
5. Calculate the value of the following expression for x = 2 and y = 1; 2x2 – 5xy – y2 + 3