Curriculum placement
Grade 1. This describes the skill, not a learner estimate.
Compare two-digit numbers
Compare two-digit values using tens and ones
Problem types
- Place and read numbers on an open number line to 120
- Compare tens and ones
- Compare with <, = or >
Builds on
- Reading and writing tens and ones
- Ordering numbers through 10 · Earlier idea
Comparing one-digit numbers extends to two-digit numbers by comparing tens first, then ones.
Leads to
- Comparing three-digit numbers · Extend the idea
Compare the largest place first, and move to the next place only when digits match. Three-digit numbers add a hundreds place to that rule.
- Coins and bills · See it applied
Two prices compare the same way as two-digit numbers, by comparing the tens place first.
- Comparing decimals to hundredths · Extend the idea
Comparing two-digit numbers by the tens digit then the ones digit extends to decimals, where the tenths digit is compared before the hundredths.
Related skills
- Rounding whole numbers · Related idea
Placing a number between two tens on a number line is the first step of rounding: it rounds to the closer ten.
- Add two-digit numbers · Shared foundations
- Hundreds, tens, and ones · Shared foundations
- Multiplying by a multiple of 10 · Shared foundations
- Ten more and ten less · Shared foundations
Open the interactive map to explore lessons and skill connections.