Mix blackcurrant squash and water in the ratio 1 : 3.
A ratio fixes the RECIPE, not the amount. 1:3 and 3:9 are the same drink because both are "one part squash for every three parts water" - the colour proves it. To scale a recipe, work out how many whole lots of the ratio you need lots) and multiply every part by that.
Step 1. Mix the flavour. Mix blackcurrant squash and water in the ratio 1 : 3.
Step 2. Party jug. Same flavour, bigger jug: fill 12 units and make it taste identical.
What to say if they get stuck
Tap a tap to pour ONE unit. The recipe card shows how many of each you need.
1 : 3 means for every 1 part squash there are 3 parts water - 4 parts of liquid altogether.
For the party jug, ask: how many lots of 4 fit into 12? Pour that many lots of the recipe.
The 11+ does not test these skills in isolation, and practising one in the wrong order wastes the practice. These are the skills the curriculum map connects this one to.
Both use multiplicative comparison but solve different structures.
Questions parents ask about scale quantities in a ratio
Answered from what the skill map records about this skill, not from a template. Every answer here is on the page, and the same questions are the page's FAQ structured data.
Find an equivalent pair of quantities by applying one scale factor. It is one of 55 named maths skills in the 11+, in the ratio strand, and this page carries 1 interactive exercise that practises it.
The two ingredients grow by the same number of times, not by the same amount. The wrong answers on this skill are built out of that, not out of random numbers, so it is worth naming out loud before your child meets it under time pressure.
Point at the next move rather than explaining the whole rule. Work out how many times the recipe is repeated by comparing 16 peaches with the 4 peaches in one batch.
The skill map draws the line here: Excludes sharing a total. A question past that line is testing a different named maths skill, which is worth knowing before you spend a week practising the wrong one.
The skill map connects it to share a total in a ratio. Both use multiplicative comparison but solve different structures. That skill has its own page here.
Use Ratio Mixer, embedded on this page. It is the exercise the skill map attaches to scale quantities in a ratio, it runs in the browser with no account to make, nothing is scored, and nothing a child does here is recorded or sent anywhere. It also has its own link, so you can send it to a child without sending them anywhere else first.
Knowing which maths topic to practise is most of the work
A free diagnostic covers arithmetic, fractions, geometry, measure and data handling, and comes back with the topics to spend the next few weeks on.
