Crayonbird
Menu

Science

Science calculations 14–16

GCSE-style science calculations for ages 14–16: physics equations with rearranging and unit prefixes, chemistry from relative formula mass and moles to concentration, yield and atom economy, and biology maths such as magnification, percentage change and genetic ratios. Every answer has its unit and a worked solution.

Start the programme
Ages 14–163 levels · 42 lessonsAbout 5 minutes a lessonFree to start

Level 1 · Unit 1

The first steps on the path

Lessons unlock one after another. Done lessons stay open for extra practice.

Try a sample lesson

This is how the first lesson starts. Sign in to play it and save stars.

Learn

Forces and motion

About 5 minutes

  • Example 1

    The distance–time graph shows a journey. What is the total distance travelled? Give your answer in m.

    Answer: 20

  • Example 2

    The distance–time graph shows a journey. What is the total distance travelled? Give your answer in m.

    Answer: 40

Let’s practise

What’s inside

3 levels · 6 units · 42 lessons. Each unit ends with a check-up that unlocks the next one.

Level 1 · Physics calculations

  1. Core calculations · 7 lessons

    • Forces and motion
    • Energy, work and power
    • Electricity
    • Waves and density
    • Units and prefixes
    • Two-step problems
    • Motion graphs

  2. Harder calculations · 7 lessons

    • Forces and motion
    • Energy, work and power
    • Electricity
    • Waves and density
    • Units and prefixes
    • Two-step problems
    • Physics calculations: Mixed (by level)
Level 2 · Chemistry calculations

  1. Core calculations · 7 lessons

    • Atoms, ions and isotopes
    • Mr and % by mass
    • Moles and concentration
    • Reacting masses and yield
    • Balancing equations
    • Energy changes
    • Rates of reaction

  2. Harder calculations · 7 lessons

    • Atoms, ions and isotopes
    • Mr and % by mass
    • Moles and concentration
    • Reacting masses and yield
    • Balancing equations
    • Energy changes
    • Chemistry calculations: Mixed (by level)
Level 3 · Biology calculations

  1. Core calculations · 7 lessons

    • Magnification
    • Osmosis
    • Genetic crosses
    • Surface area : volume
    • Quadrats and populations
    • Magnification · Challenge
    • Osmosis · Challenge

  2. Harder calculations · 7 lessons

    • Magnification
    • Osmosis
    • Genetic crosses
    • Surface area : volume
    • Quadrats and populations
    • Magnification · Challenge
    • Biology calculations: Mixed (by level)

About this programme

The calculations follow the maths skills listed in the GCSE combined science and separate science subject content for England. Significant-figure rules are stated in each question.

Crayonbird is not linked to any exam board. Every question is original and generated by code, and the answer keys are worked out exactly, so they are always right.

Questions grown-ups ask

How do I type answers like √12 or x ≥ 3?

A maths keypad under each answer box has √, powers, fractions, π, brackets and ≤ ≥. Answers are checked by value, and you get a nudge when the value is right but not yet in its simplest or factorised form.

How long is a lesson?

Most lessons take 5 to 10 minutes: a short learn card, practice that is marked as you go, and often a quick game. Little and often works best.

Do children need an account?

A grown-up signs up and adds a child profile; children never need an email or password. Class students sign in with their class code and PIN.

Is the practice the same every time?

No. Every practice step is generated fresh, so a child can repeat a lesson as often as they like and still get new questions.

Can I see how my child is doing?

Yes. The parent dashboard shows each programme, the level, stars, when your child last practised, and the skills that are going well or need more work.

Can I print the lessons?

Lessons are made for the screen, but every practice sheet can also be printed from the worksheet maker.

More programmes