Skip to main content

Our Primary and Secondary
Advent calendars are back!

Main navigation

Teachers
Students
Parents
- Early years
- Primary
- Secondary
- Post-16
Problem-Solving Schools
Events
About NRICH

Search NRICH

Or search by topic

Number and algebra

Properties of numbers
Place value and the number system
Calculations and numerical methods
Fractions, decimals, percentages, ratio and proportion
Patterns, sequences and structure
Coordinates, functions and graphs
Algebraic expressions, equations and formulae

Geometry and measure

Measuring and calculating with units
Angles, polygons, and geometrical proof
3D geometry, shape and space
Transformations and constructions
Pythagoras and trigonometry
Vectors and matrices

Probability and statistics

Handling, processing and representing data
Probability

Working mathematically

Thinking mathematically
Mathematical mindsets

Advanced mathematics

Calculus
Decision mathematics and combinatorics
Advanced probability and statistics
Mechanics

For younger learners

Early years foundation stage

Solution

39518

Problem

Fifteen cards Back to problem

First name

maths club

School

Windmill

Country

Age

10

8 7 13 10 6 12 9 is one solution

Footer

Sign up to our teacher newsletter
Technical help
Accessibility statement
Contact us
Terms and conditions

Links to the NRICH Twitter account
Links to the NRICH Facebook account
Links to the NRICH Bluesky account

NRICH is part of the family of activities in the Millennium Mathematics Project.