GCSE Computer Science
Mae disgrifiad y cymhwyster yn Saesneg yn unig, gan ei fod wedi ei gymryd o fanyleb Saesneg CBAC.
Numeracy is heavy and specific: learners convert between denary, binary and hexadecimal, add in binary, work with base 2 storage units, calculate image, sound and compressed file sizes and routing costs, and reason with truth tables and DIV and MOD. Literacy centres on close reading of the Unit 2 scenario and requirements, precise technical vocabulary, short and extended judgement answers in Unit 1, and code annotation and test commentaries. The single biggest thing Key Stage 3 should build is fluent place value in base 2 and base 16, so that storage and file size calculations become routine.
- Corff dyfarnu
- CBAC
- Lefel
- Level 1 and Level 2
- Addysgu gyntaf
- Medi 2025
- Faint o waith llythrennedd
- Canolig
- Faint o waith rhifedd
- Uchel
- Manyleb
- Agor y fanyleb
Sut mae'r cymhwyster hwn yn cael ei asesu
- Unit 1: Understanding Computer Science: Digital examination 1 hour 30 minutes, 50%, 80 marks
- Unit 2: Computer Programming: On-screen examination based on a pre-released brief, 2 hours, 50%, 80 marks, set and marked by WJEC
Sgiliau sy'n defnyddio Rhuglder
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Converting between denary, binary and hexadecimal
Learners convert between denary, binary and hexadecimal, perform binary addition, use arithmetic shifts and explain overflow and underflow. All of this rests on secure place value and powers of 2.
Rhifedd: Y system rif, Cyfrifiad, Perthnasoedd yn y system rif, Dealltwriaeth gysyniadol, Rhuglder, Rhesymu rhesymegol
Paratoi disgyblion
- Blwyddyn 7
- Pupils use binary place-value cards from 128 down to 1 to make their age and house number, write each as 8-bit binary and check by adding the place values.
- Blwyddyn 8
- Pupils add two 8-bit binary numbers in columns, convert the answer to denary to check it, and explain in one sentence what happens when a ninth bit is needed.
- Blwyddyn 9
- Pupils convert web colour codes such as FF8800 from hexadecimal to denary and binary, and show that a left shift of one place doubles a binary number.
Dangos geiriad y fanyleb a datganiadau'r Fframwaith Llythrennedd a Rhifedd
Ble mae yn y fanyleb: Unit 1, Section 1.2.1, page 13
“convert between, denary, binary and hexadecimal counting systems”
Cam cynnydd 3
Rwy'n gallu darllen ac ysgrifennu rhifau hyd at 1 filiwn a rhifau hyd at 3 lle degol.
Rwy'n gallu adio a thynnu rhifau gan ddefnyddio rhifau cyfan a degolion.
Rwy'n gallu defnyddio amrywiaeth o strategaethau i wirio cyfrifiadau gan gynnwys defnyddio gweithrediadau gwrthdro, cyfrifiadau cywerth a rheolau rhanadwyedd.
Cam cynnydd 4
Rwy'n gallu defnyddio pwerau a deall pwysigrwydd pwerau 10.
Rwy'n gallu cynrychioli cysyniad mewn ffyrdd gwahanol, gan lifo rhwng cynrychioliadau gwahanol gan gynnwys rhai llafar, diriaethol, gweledol, digidol a haniaethol.
Rwy'n gallu defnyddio'r pedwar gweithrediad a'r cysylltiadau rhyngddyn nhw, e.e. cymhwyso swm rhannu fel gwrthdro i swm lluosi.
Cam cynnydd 5
Rwy'n gallu cynrychioli cysyniad mewn ffyrdd gwahanol, gan lifo rhwng cynrychioliadau gwahanol gan gynnwys rhai llafar, diriaethol, gweledol, digidol a haniaethol.
Rwy'n gallu defnyddio ffeithiau a thechnegau cadarn, cofiadwy a defnyddiadwy er mwyn cymhwyso'r dulliau mwyaf effeithlon.
Rwy'n gallu dilysu a phrofi canlyniadau a datrysiadau.
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Data storage units and capacity
Learners must know the base 2 storage units from bit and nibble to petabyte, where each step is 1,024 not 1,000, and calculate the capacity needed to store data.
Rhifedd: Mesur, Cyfrifiad, Y system rif, Perthnasoedd yn y system rif, Cyfathrebu â symbolau, Rhuglder, Dealltwriaeth gysyniadol
Paratoi disgyblion
- Blwyddyn 7
- Pupils order bit, nibble, byte, kilobyte, megabyte and gigabyte on a class washing line and work out how many bits are in one kilobyte.
- Blwyddyn 8
- Pupils work out how many 3 MB photos fit on a 16 GB memory stick, first estimating with 1,000 and then calculating with 1,024, and explain the difference.
- Blwyddyn 9
- Pupils total the file sizes in a sample project folder, convert the total into the most sensible unit and judge whether it fits their school network storage allowance.
Dangos geiriad y fanyleb a datganiadau'r Fframwaith Llythrennedd a Rhifedd
Ble mae yn y fanyleb: Unit 1, Section 1.2.1, pages 13 to 14
“the relationship between data storage units using the base 2 prefixes”
Cam cynnydd 3
Rwy'n gallu trosi unedau metrig o hyd i unedau llai, e.e. cm i mm, m i cm, km i m.
Rwy'n gallu lluosi rhifau a degolion â lluosrif o 10, e.e. 15 x 30, 1.4cm x 20.
Rwy'n gallu darllen ac ysgrifennu rhifau hyd at 1 filiwn a rhifau hyd at 3 lle degol.
Cam cynnydd 4
Rwy'n gallu defnyddio'r unedau mesur cyffredin, trosi rhwng unedau cysylltiedig y system fetrig a chwblhau cyfrifiadau.
Rwy'n gallu defnyddio pwerau a deall pwysigrwydd pwerau 10.
Rwy'n gallu ddarllen ac ysgrifennu rhifau o unrhyw faint.
Cam cynnydd 5
Rwy'n gallu defnyddio nodiant, symbolau ac unedau mesur priodol, gan gynnwys mesurau cyfansawdd.
Rwy'n gallu defnyddio ffeithiau a thechnegau cadarn, cofiadwy a defnyddiadwy er mwyn cymhwyso'r dulliau mwyaf effeithlon.
Rwy'n gallu dehongli atebion o fewn cyd-destun y broblem ac ystyried a yw atebion, gan gynnwys dangosyddion cyfrifiannell, analog a digidol, yn synhwyrol.
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Calculating the cost of routing data
Learners calculate the cost of routing data across a network by adding link costs along possible routes and comparing the totals to find the cheapest.
Rhifedd: Cymhwysedd strategol, Cyfrifiad, Rhuglder
Paratoi disgyblion
- Blwyddyn 7
- Pupils find the cheapest route for a message between rooms on a school map where each corridor has a cost, adding the totals for three routes.
- Blwyddyn 8
- Pupils list every route between two routers on a six-node network diagram with decimal link costs, add each total and circle the lowest.
- Blwyddyn 9
- Pupils recalculate the cheapest route when one link on a network diagram fails and write a sentence justifying their new choice with the totals.
Dangos geiriad y fanyleb a datganiadau'r Fframwaith Llythrennedd a Rhifedd
Ble mae yn y fanyleb: Unit 1, Section 1.3.1, page 15
“cost calculation of routing data on a network.”
Cam cynnydd 3
Rwy'n gallu dewis, treialu a gwerthuso amrywiaeth o ddulliau posibl a rhannu problemau yn gyfres o dasgau.
Rwy'n gallu adio a thynnu rhifau gan ddefnyddio rhifau cyfan a degolion.
Rwy'n gallu dewis a chymhwyso strategaethau gwirio priodol.
Cam cynnydd 4
Rwy'n gallu dewis, treialu a gwerthuso amrywiaeth o ddulliau posibl a rhannu problemau cymhleth yn gyfres o dasgau.
Rwy'n gallu defnyddio dulliau ysgrifenedig effeithlon i adio a thynnu rhifau a degolion o unrhyw faint, gan gynnwys cymysgedd o rifau mawr a bach â niferoedd gwahanol o leoedd degol.
Rwy'n gallu dewis a chymhwyso strategaethau gwirio priodol.
Cam cynnydd 5
Rwy'n gallu dewis, treialu a gwerthuso amrywiaeth o ddulliau posibl a rhannu problemau cymhleth yn gyfres o dasgau.
Rwy'n gallu blaenoriaethu a threfnu'r camau perthnasol sydd eu hangen i gwblhau'r dasg neu ddod o hyd i ddatrysiad.
Rwy'n gallu dewis a chymhwyso strategaethau gwirio priodol.
Da gwybod
- No marks are set aside for spelling, punctuation and grammar. The assessment objectives on page 28 cover only knowledge (AO1), application (AO2) and analysis (AO3), so accuracy of language is not separately credited.
- Both units are answered on screen, page 5: Unit 1 is a "Digital examination: 1 hour 30 minutes" and Unit 2 is an "On-screen examination based on a pre-released brief: 2 hours". Pupils need to type extended answers and calculations.
- The specification does not say whether a calculator is allowed in either unit, so centres should check the WJEC instructions for each series. Pupils should be able to do binary, hexadecimal and storage calculations by hand.
- No notes are allowed into the Unit 2 examination, page 28: "learners are not permitted to take any prompts or notes into the examination." A clean copy of the pre-release is provided.
- Unit 1 mixes question types, page 5: "Questions requiring objective responses, short and extended answers."
- Storage units use 1,024, not 1,000, page 13: "kilobyte (i.e. 1,024 bytes)". Pupils who learn 1,000 in Science or Mathematics need the difference made explicit.
- Appendix B, pages 34 to 36, fixes the operators and pseudocode conventions used in questions: "Logical operators AND OR NOT XOR will be in upper case." DIV and MOD are defined with worked examples such as "11 MOD 2 = 1".
- Appendix A, page 32, marks the numeracy strands for geometry and measurement and for statistics and probability as N/A for both units, so there is no graphing or statistics demand.
Cysylltiadau â chymwysterau eraill
Place value, powers, ratio and percentage reduction are taught in Mathematics, so agreeing shared language (for example 'column value' and 'simplest form') with the Mathematics department in Years 7 to 9 will help pupils transfer these skills to binary and file size work.
Ffynhonnell: WJEC GCSE Computer Science specification, teaching from 2025, for award from 2027, Version 3, September 2025.