Skip to content
Oak National Academy
Oak National Academy
Teachers
Pupils
Oak National Academy
Teachers
Home
Key stage 1
Key stage 2
Key stage 3
Key stage 4
EYFS
Specialist
Curriculum plans
Plan a lesson
Support your team
Pupils
Home
Oak
Blogs
Webinars
About us
Contact us
Help
Oak National Academy
Home
Key stage 2
Maths
Informal and mental strategies for adding and subtracting two 3-digit numbers
Use addition and subtraction to solve problems in different contexts
Share
Share your lesson
Loading