Skip over navigation
NRICH
Main menu
Search
accessibility
contact
Skip over navigation
Terms and conditions
Home
nrich
Students
primary
Resources for ages 5-11
primary students
secondary
Resources for ages 11-18
secondary students
Teachers
early years
Early Years Foundation Stage; US Kindergarten
Early years
primary
Key Stage 1&2; US Grades 1-5
Primary teachers
secondary
Key Stage 3-5; US Grades 6-12
Secondary teachers
More links
Topics
Events
Nrich Events
Donate
Donate to NRICH
PD
PD
NRICH at Stage 1
NRICH at Stage 1
Related
The Problem with Problem Solving at Stage 1
The Problem with Problem Solving at Stage 2