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Class 8 maths olympiad preparation

5 full papers on the International Mathematics Olympiad blueprint: 50 questions, 60 marks, 60 minutes. Timed like the real thing, and every wrong answer tells you which mistake it came from instead of just turning red.

What a class 8 paper looks like

50
questions
60
marks
60
minutes
SectionQuestionsMarks eachSection total
Logical Reasoning15115
Mathematical Reasoning20120
Everyday Mathematics10110
Achievers Section5315
Whole paper5060

Five Achievers questions carry 3 marks each, so a seventh of the questions is worth 25% of the paper. That is the whole reason a rank and a good score are not the same thing.

One class 8 Achievers question

The section that decides the rank, so it is the one worth showing. Have a go before opening the answer. The other 49 questions on this paper, and the rest of the 250 written for class 8, are behind the paper itself. How Achievers questions work.

5 pointsQuestion 46

When all the whole numbers from 1 up to n are multiplied together, the answer ends in exactly 25 zeros. What is the SMALLEST value of n for which this happens?

Show the answer and how to see it

Answer: 105

Zeros at the end come from pairs of 2 and 5, and 5s are the scarce one, so count how many 5s the product holds. That count does not climb one at a time: at 25, 50, 75 and 100 it jumps by two, because those numbers carry a second 5. Exactly 25 zeros first appears at 105.

Why a child picks 100: The product up to 100 ends in 24 zeros, not 25, because 25, 50, 75 and 100 each contribute an extra 5.

Sit the whole paper this came from

Questions parents ask

How many questions are on a class 8 maths olympiad paper?

Our class 8 papers carry 50 questions for 60 marks in 60 minutes: 15 Logical Reasoning, 20 Mathematical Reasoning, 10 Everyday Mathematics, 5 Achievers Section. The first three sections are worth 1 mark each and the five Achievers questions are worth 3.

Why is the Achievers Section worth more?

Because it is where the rank is decided. Five questions at 3 marks is 15 of the 60 marks on the paper, so a child who skips them has capped their score at 75% before starting.

Is there a negative mark for a wrong answer?

Not in our papers. A blank and a wrong answer score the same, so there is never a reason to leave a question unanswered. Check the current official rules at Science Olympiad Foundation for the real exam.

How long should a class 8 child spend on each question?

60 minutes for 50 questions is a little under 72 seconds each on average, but that average is misleading. The first three sections should go faster than that, precisely so the five Achievers questions can go slower.

What is the difference between Mathematical Reasoning and Everyday Mathematics?

Mathematical Reasoning asks whether a child can do the maths. Everyday Mathematics asks whether they can find the maths inside a paragraph about money, time or measurement. Plenty of children can do one and not the other, which is why they are scored apart.

How many practice papers do you have for class 8?

5 complete papers, which is 250 questions for this class alone, out of 1,350 across classes 3 to 8. Every one was written by hand rather than generated, and every answer key is recomputed by a second independent route before it ships.

Do the questions repeat between papers?

No. Every new question is checked against all 1,350 already in the bank by two independent models before it is accepted, and anything they both call the same problem is thrown out rather than reworded.

Does my child need to know anything beyond the class 8 syllabus?

Rarely in content, often in demand. The topics are ones a class 8 child has met, but a question may combine two of them, or ask for the condition under which something is true instead of asking for a value.

What does a wrong answer tell us?

More than the score does. Every wrong option in our papers is built from a specific mistake, and the paper names it: a unit missed, a factor confused with a multiple, an intermediate step answered instead of the question. That is the part a downloadable past paper cannot give you.

Is this the official SOF paper?

No. These are our own questions written on the International Mathematics Olympiad blueprint, and we are not affiliated with Science Olympiad Foundation. The official papers, dates and rules are at their site.

Sit a full class 8 paper

50 questions, 60 minutes, scored at the end with every answer explained.

Choose a paper
Other classes: class 3, class 4, class 5, class 6, class 7.

Blueprint from the Science Olympiad Foundation. We are not affiliated with them and these questions are our own.