Learning aim
Pupils can explain why the house always has a mathematical edge, calculate the expected value of a simple bet, recognise the gambler's fallacy and loss-chasing, identify how gambling-style products and advertising normalise gambling, state the UK law and self-exclusion options, and name where to get help.
Curriculum links (four UK nations)
- PSHE Association KS4: assessing and managing risk; gambling and gambling-related harm; recognising and challenging persuasive influence and advertising.
- Citizenship KS4 (England): rights and responsibilities; making informed financial decisions and managing risk.
- Maths KS4 (England): probability — calculate expected outcomes; relative frequency; independent events.
- Scotland (CfE / Senior phase): Health & Wellbeing — risk and decision-making; Numeracy — probability and expected outcomes.
- Wales: Health & Well-being AoLE — risk and influence; Mathematics & Numeracy — probability.
- Northern Ireland: Learning for Life and Work — risk and personal finance; Mathematics & Numeracy — probability.
See the full mapping on the teacher curriculum map.
What you'll need
- Mini-whiteboards + pens; calculators
- A standard die (or a slide simulating one) for the expected-value task
- Worksheet: expected value & RTP grid
- One short, pre-vetted clip or screenshot of a gambling/skin "big win" promotion (teacher-selected; do not ask pupils to find their own)
Background for the teacher
- House edge / Return To Player (RTP). Commercial gambling games are built so the operator keeps a percentage on average. "RTP 96%" means that, over a very large number of plays, about £96 is returned for every £100 staked — an average loss of £4 per £100. The edge is structural, not bad luck.
- Expected value (EV). The average outcome per bet if it were repeated many times. Commercial gambling has negative EV for the player, so no staking "system" can overcome it — past results do not change independent future ones (the gambler's fallacy).
- Loss-chasing & near-misses. Designs that show "so close" and encourage betting more to win losses back are the strongest harm signals.
- Gambling-style products. Loot boxes, third-party "skin betting" sites, social-casino apps, and some crypto/"trading" apps borrow gambling mechanics and marketing. Skin-betting sites are usually unlicensed and illegal for under-18s.
- UK law. Gambling in Great Britain is regulated by the Gambling Commission under the Gambling Act 2005; the minimum age is 18 for essentially all gambling (the National Lottery minimum age is also 18). GAMSTOP is the free national self-exclusion scheme for online gambling. Betting advertising is restricted (for example a "whistle-to-whistle" ban around live sport before 9pm), but exposure through sponsorship and social media remains high.
- Statistics: if you cite figures, use the Gambling Commission's current "Young People and Gambling" report rather than older numbers, and present them as ranges, not precise claims.
Lesson structure (60 minutes)
5 min
HOOK
HOOK
Display a claim: "Just double your bet after every loss — you can't lose long-term." Pupils thumbs-up / thumbs-down on whiteboards and give one reason. Park responses; the maths will settle it.
18 min
TEACH
TEACH
Teach house edge / RTP, expected value, the gambler's fallacy and loss-chasing, gambling-style products, advertising/influencer normalisation, and the UK law (using the background above). Core message: commercial gambling is designed so the player loses on average; "systems" fail because each play is independent and the edge never goes away.
15 min
GUIDED
GUIDED
Compute EV. "You stake £1 to pick one number on a fair 1-6 die. Guess right and you get £4 back (net +£3); wrong and you lose your £1." EV = (1/6)(+£3) + (5/6)(-£1) = £0.50 - £0.83 = -£0.33 per £1 — about a 33% house edge. Then interpret an RTP of 96% as an average £4 loss per £100. Pupils conclude why the "double after a loss" system still loses (and hits bet limits / runs out of money).
14 min
CHALLENGE
CHALLENGE
Show the pre-vetted "big win" clip. Pupils annotate: who profits, what is hidden (losses, free/sponsored stakes, survivorship — only wins get posted), and why it makes viewers more likely to bet. Extension: compare a regulated 18+ operator (age checks, GAMSTOP, limits) with an unlicensed skin-betting site, and draft a 20-word harm-reduction message for peers.
8 min
PLENARY
PLENARY
Pupils list three warning signs that gambling (or game spending) has become harmful — e.g. chasing losses, hiding it, borrowing or selling to fund it, it stops being fun. Close on the support routes (below) and that under-18s should not gamble at all.
Adapting for all learners
Support
Provide the EV calculation as a part-completed table with the fractions filled in. Give the RTP interpretation as a worked £100 example. Sentence starters for the clip analysis.
Stretch
Generalise EV to a roulette-style bet; compare two RTPs and the long-run loss over 1,000 plays; evaluate whether advertising restrictions are sufficient and justify with reasoning.
SEND adaptations
- Pre-teach vocabulary with visuals: odds, edge, average, independent, chasing.
- Use the concrete die demo before the abstract formula.
- Offer the clip analysis as a structured checklist rather than free writing.
- Provide a calm opt-out for any pupil for whom this topic is sensitive (see safeguarding).
EAL support
- Bilingual key-word list: probability / average / loss / advertising / help.
- Keep the maths visual and worked; allow answers as annotated calculations.
- Provide the warning-signs list as labelled icons to match.
Assessment criteria
- Working towards: can state that gambling games are designed so players lose on average.
- Expected: can calculate the EV of the die bet, interpret an RTP, and explain the gambler's fallacy.
- Greater depth: can explain why a staking system cannot beat a negative-EV game, deconstruct how a "big win" clip misleads, and distinguish regulated vs unlicensed products and the relevant UK law.
Homework pack
- EV calculation. A £2 bet pays £10 back (net +£8) on a 1-in-8 chance, else you lose the £2. Calculate the expected value per bet and say who it favours. (Answer: (1/8)(+£8) + (7/8)(-£2) = £1 - £1.75 = -£0.75; favours the operator.)
- Spot the technique. Find one example of gambling or gambling-style advertising (sport sponsorship, app store, social media). Write two sentences on the technique used and who it targets. No sign-ups, no spending.
- Signpost task. Write the three support routes from this lesson from memory.
Classroom safeguarding
This is a high-sensitivity topic. Some pupils will be affected by gambling harm — their own, a friend's or a family member's. Keep all activity analytical and about design, advertising and maths. Never ask pupils to disclose their own or their family's gambling, losses or debts, and do not run any real or simulated betting with money.
If a pupil discloses harm to themselves or others, follow your school's safeguarding policy and inform the Designated Safeguarding Lead the same day. Respond calmly and without judgement; do not promise confidentiality.
Support to share and leave on display:
- Childline — free and confidential, under 19: childline.org.uk or 0800 1111.
- National Gambling Helpline (GamCare) — free, 24/7: 0808 8020 133, gamcare.org.uk.
- GambleAware: begambleaware.org. GAMSTOP (online self-exclusion): gamstop.co.uk.
- Reinforce: under-18s should not gamble at all; it is always okay to ask a trusted adult for help.
Related lesson plans
This is general financial and PSHE education, not advice. See our editorial & sourcing policy. Free to use in UK classrooms under Creative Commons CC BY 4.0 with attribution to UK Tax Drag.