Curriculum placement
Grade 1. This describes the skill, not a learner estimate.
Add two-digit numbers
Add a two-digit number using tens and ones
Problem types
- Make a new ten
Builds on
Leads to
- Adding within 100
- Perimeter of a polygon · See it applied
Adding side lengths of two digits finds the distance around a shape.
- The four operations with decimals · Extend the idea
Adding decimals lines up place values and regroups, exactly like adding two-digit numbers, with the decimal point staying in line.
- Profit, cost, and taxes · See it applied
Adding two-digit prices and costs finds the amount spent, and subtracting it from income finds profit.
Related skills
- Equations for addition and subtraction stories · Shared foundations
- Compare two-digit numbers · Shared foundations
- Counting on and counting back · Shared foundations
- The meaning of the equal sign · Shared foundations
- Hundreds, tens, and ones · Shared foundations
Open the interactive map to explore lessons and skill connections.