Numbers  Multiples, Factors and Primes

The recipe for flapjacks
is 250 g of oats,
150 g of brown sugar and 100 g of margarine.
What fraction of the mixture is:
 oats? _________
 sugar? _________
 oats? _________

The ratio of girls to boys in a school is 7:6
If there are 455 pupils in total, how many are
 girls? _________
 boys? _________
 girls? _________

Sarah works as a waitress.
Each week, she splits her wage into spending money and savings in the ratio 7:3.

One week, Sarah earns £130.
How much should she put in her savings that week?
_________

The next week, Sarah put £42 into her savings.
How much did she earn in total that week?
_________

One week, Sarah earns £130.
How much should she put in her savings that week?
_________

An architect is drawing the plan of a house to a scale of 1 cm to 3 m.
 Write this ratio in its simplest form.
_________
 How wide is a room that appears as 2 cm on the drawing?
_________
 The hall is 10 m long.
How long will the architect need to make it on the drawing?
_________
 Write this ratio in its simplest form.
_________

Concrete is mixed using cement,
sand and gravel in the ratio 1:3:6.
If Dave uses a 5 kg bag of cement, how much:
Make sure you convert to the same units when you're working out the ratio.
 sand does he need? _________
 gravel does he need? _________
 If Dave needs 80 kg of concrete, how much of each substance does he need?
_________
 sand does he need? _________

If I picked some strawberries after a few wet days.
Some were nibbled by snails,
some were mouldy and some fine.
The ratio was 2:3:10 respectively.
If 9 strawberries were mouldy how many:
 were fine? _________
 were not fine? _________
 What fraction of the total amount were fine?
_________
 were fine? _________

Salt & Vinegar, Cheese & Onion
and Prawn Cocktail flavour crisps were sold in the school tuck shop
in the ratio 5:3:2
If 18 bags of Prawn Cocktail were sold,
how many bags:
 of Salt & Vinegar were sold?
_________
 were sold altogether?
_________
 of Salt & Vinegar were sold?
_________