PHIConnections
MATHLYMPICS
ANNUAL MATHLYMPICS FOR ALL SINGAPORE PRIMARY SCHOOLS 2021 AND INTERNATIONAL STUDENTS
This competition is open to all students enrolled in Primary 5 or Under12 category (Children born after 1 January 2010). Topics will include Arithmetic, Number Theory, Combinatorics, Logic,
Geometry, Measurement and Algebra.

Preliminary Round
Date : 8th August 2021
Time : 3.00 pm – 4.30 pm
Mode : Online 
Competition Fee: THB 900
Format of the Paper in the Preliminary Round
Duration: 1.5 hours
Consists of only the Vault Event comprising 28 questions.
Marks are allotted as follows:
Questions 1 to 10: 2 marks each
Questions 11 to 20: 4 marks each
Questions 21 to 28: 5 marks each
Use of calculators is ALLOWED.
Results of the Preliminary Round competition will be posted on the Phi Connections website (https://www.phiconcection.org) after 14th August 2021.

Final Round
International participants whose Prelim results are equivalent to the results of Singapore’s top 500 participants will be invited to the Final Round (International).
Their results at the Final Round will also be tallied with the equivalent results of Singapore’s top 100 for the Gold award, next 150 for Silver award and the remaining finalists for Bronze award.
Date : 22nd August 2021
Time : 3.00 pm – 5.00 pm
Mode : Online 
Competition Fee: THB 750
No arrangements will be made for an alternative sitting. This is to ensure fairness and the integrity of the competition. We seek your understanding on this matter. Finalists who are absent from the Final Round will be awarded Certificate of Merit.

The Final Round will be administered online as it will probably still not be safe to bring 250 participants into a common venue. Participants will take the competition in their own homes. Registrants must be aware that should they qualify to compete in the Final Round, they MUST have access to a computer (Windows or Mac,) with webcam facilities and stable internet access at home. Tablets will not be suitable.
Participants may also use their own calculators.
Marks will be awarded for correct answers only. There will be no deduction of marks for errors for both the Preliminary and the Final Round. All decisions made by the organizers and judges will be final.
Information the competition online platform (To be advice)
Scope of the Mathlympics Competition
Topics will include arithmetic, number theory, combinatorics, logic, geometry, measurement, and algebra.
Arithmetic

Addition, subtraction, multiplication, division, manipulations of whole numbers, fractions, decimals, percentages and square root.
Example:
If 48 is added to onethird of a number, the answer is triple the number. What is the number?
Number Theory

Divisibility, prime numbers, exponential numbers (eg. 22, 23), number patterns and sequences.
Example:
The greatest number of Mondays which can occur in 45 days is ___.
Combinatorics

Finding largest, smallest or optimal number of objects satisfying certain criteria, deciding when the criteria can be met.
Example:
Vicky has four cubes of different colours – green, red, blue and yellow.
The number of different ways they can be stacked one upon the other is ____.
Logic

Inferring relationships between objects given a set of clues.
Example:
Mary, John and Pete have red, brown, and blonde hair, and are 13, 14, and 15 years old. Using the following clues determine the hair colour, and age of each child.
1. The youngest has blonde hair.
2. John is older than Pete.
3. John does not have red hair and Pete does not have blonde hair.
Geometry

Size, shape (angles, symmetry) and relative position of figures and properties of space.
Example:
Zul has a wire 23 cm long. He wants to bend the wire to form triangles which have 3 different sizes. The number of triangles that can be formed with sides of whole number units is _____.
Measurement

Magnitude of some attribute of measures of an object relative to standard measurements. Includes Rate and Speed.
Example:
A fence is 18 metres long. The fence posts are 3 metres apart.
How many posts are there in the fence?
Algebra.

Using symbols as "place holders" to denote constants and variables, and the rules governing mathematical expressions and equations involving these symbols.
Example:
You are in a queue at the watercooler. You are the x person from the front and the y person from the back. How many people are there in the queue?
If you would like a copy of an exemplar Prelim Papers, please click on the links below:
Prelim Paper, Mathlympics: Questions (PDF, 259 KB) Past Papers [ 2018 ]