### There are 20 results

Broad Topics >

Fractions, Decimals, Percentages, Ratio and Proportion > Calculating with ratio & proportion

##### Age 7 to 16 Challenge Level:

Making a scale model of the solar system

##### Age 11 to 14 Challenge Level:

When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?

##### Age 11 to 14 Challenge Level:

The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?

##### Age 7 to 11 Challenge Level:

Mum, Dad, Tim and Jill moved into a new house. If they cut down the
big tree, will it miss the greenhouse?

##### Age 11 to 14 Challenge Level:

Can you work out which drink has the stronger flavour?

##### Age 11 to 14 Challenge Level:

Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?

##### Age 11 to 16

Mainly for teachers. More mathematics of yesteryear.

##### Age 7 to 11 Challenge Level:

Peter wanted to make two pies for a party. His mother had a recipe for him to use. However, she always made 80 pies at a time. Did Peter have enough ingredients to make two pumpkin pies?

##### Age 11 to 14 Challenge Level:

Is there a temperature at which Celsius and Fahrenheit readings are the same?

##### Age 11 to 14 Challenge Level:

At the beginning of the night three poker players; Alan, Bernie and Craig had money in the ratios 7 : 6 : 5. At the end of the night the ratio was 6 : 5 : 4. One of them won $1 200. What were the. . . .

##### Age 7 to 14 Challenge Level:

Some of the numbers have fallen off Becky's number line. Can you figure out what they were?

##### Age 11 to 14 Challenge Level:

My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?

##### Age 11 to 14 Challenge Level:

A garrison of 600 men has just enough bread ... but, with the news
that the enemy was planning an attack... How many ounces of bread a
day must each man in the garrison be allowed, to hold out 45. . . .

##### Age 11 to 14 Challenge Level:

Build a scaffold out of drinking-straws to support a cup of water

##### Age 7 to 11 Challenge Level:

A 750 ml bottle of concentrated orange squash is enough to make fifteen 250 ml glasses of diluted orange drink. How much water is needed to make 10 litres of this drink?

##### Age 11 to 14 Challenge Level:

Which is a better fit, a square peg in a round hole or a round peg
in a square hole?

##### Age 11 to 14 Challenge Level:

Anne completes a circuit around a circular track in 40 seconds.
Brenda runs in the opposite direction and meets Anne every 15
seconds. How long does it take Brenda to run around the track?

##### Age 7 to 11 Challenge Level:

Sam's grandmother has an old recipe for cherry buns. She has enough
mixture to put 45 grams in each of 12 paper cake cases. What was
the weight of one egg?

##### Age 7 to 11 Challenge Level:

Can you work out the height of Baby Bear's chair and whose bed is
whose if all the things the three bears have are in the same
proportions?

##### Age 7 to 11 Challenge Level:

Explore this interactivity and see if you can work out what it
does. Could you use it to estimate the area of a shape?