Page 62 - Math Smart - 7

Check My
Understanding

O a) How many hours are there in 3 days?
b) How many hours are there in 7 days?
c) Write down a formula for the number of hours In a days.
O A small bus can carry 13 passengers. A large bus can carry 60 passengers.
a) How many passengers can be carried by 1 small bus and 1 large bus?
b) How many passengers can be carried by 5 small buses and 3 large buses?
c) Write down a formula for the total number of passengers, P, which can be carried
by .V small buses and y large buses.
0 The formula for changing minutes, m, into hours, h, is h =
Use the formula to find h when
a) m = 120 minutes b) m = 300 minutes c) m = 45 minutes
O The number of hours in a given number of days can be found by multiplying the
number of c/ays by 24.
a) Use the green letters to write the formula using variables.
b) Use the formula to calculate the number of hours in 14 days.
0 The number of classrooms needed in a school can be estimated by dividing the
number of pupils in the school by the average number of pupils in the class.
a) Use the green letters to write the formula using variables.
b) Use the formula to find the number of classrooms needed in a school of
300 pupils that has an average of 30 pupils in a class.
O The perimeter of a rectangle is found by adding its /ength to its width and doubling
the answer.
a) Use the green letters to write the formula using variables.
b) Use the formula to find the perimeter of a rectangle that is 7 cm long and
2 cm wide.
0 The average speed of a runner can be found by dividing the distance covered by the
time taken.
a) Use the green letters to write the formula using variables.
b) Use the formula to determine the average speed of a runner who covers
80 metres in 10 seconds.
If
0 you count the number of seconds between a flash of lightning and the noise of
the thunder and multiply this by 3, you get the distance in /cilometres to the centre
of the storm.
a) Use the green letters to write the formula using variables.
b) Use the formula to work out how many kilometres away the centre of the storm
is if you count 15 seconds between the flash of lightning and the noise of the
thunder.

I UNIT 3 I Introduction to Algebra and Equations