Edexcel International A-Level Biology Maths Worked Solutions
Edexcel International A-Level Biology Maths Worked Solutions
Complete, step-by-step worked solutions to every maths question in the Pearson Edexcel International A-Level Biology (YBI11) past papers – written as clear teaching scripts by a Chartered Biologist and experienced A-Level examiner. The perfect companion for mastering the calculation questions that students most often drop marks on.
At least 10% of the marks in Edexcel International A-Level (YBI11) come from mathematical skills, and these are the questions students drop most often – not because the biology is hard, but because the method is never shown in full. Mark schemes give the answer and a couple of terse marking points; they rarely show you how to get there. This pack closes that gap.
Every calculation question from the Edexcel International A-Level (YBI11) past papers is worked through as a teaching script: the reasoning, the units, the rounding, and the exact point at which each mark is earned. It covers the full spread of the board’s examinable maths – magnification and scale bars, percentage change, rates, log scales, the unpaired t-test, the chi-squared test and Spearman’s rank, Hardy-Weinberg and Simpson’s index of diversity.
What’s inside
- Step-by-step worked solutions to every maths question in the Edexcel International A-Level (YBI11) past papers
- Each solution written as a teaching script – not just the final answer, but how to reach it
- Partial-credit notes showing exactly where each mark is earned
- Common-mistake warnings flagging the errors examiners see most
- Full coverage of the board’s maths skills, including the unpaired t-test, the chi-squared test and Spearman’s rank
- Guidance on choosing the right statistical test and stating a valid conclusion against the critical value
- Instant PDF download – print it or use it on screen
A worked solution, in full
Here is the kind of question students most often lose marks on, worked exactly as it appears in the pack.
Q. An enzyme’s rate rose from 12 to 30 arbitrary units when the temperature increased. Calculate the percentage change. (2 marks)
Examiner note: dividing by 30 (the new value) instead of 12 is the classic error – it scores zero. The pack shows which value is the denominator on every percentage question.
How to use it
Work each past-paper calculation yourself first, then check your method – not just your answer – against the worked script. Because every step is shown, you can see precisely where a method broke down: a missed unit conversion, the wrong denominator in a percentage change, or the wrong statistical test for the data. The same handful of maths skills recur across the papers, so a few focused hours removes a predictable, repeated source of lost marks before the exam.
Who it’s for
Edexcel International A-Level (YBI11) students in Year 12 and Year 13, and tutors or teachers who want ready-made, mark-scheme-accurate model solutions to teach or set from. It pairs naturally with the matching free maths skills page, linked below, which explains each technique before you drill it on the papers here.