CCSS.Math.Content.2.NBT.A
The standard
Understand place value.
Common Core State Standards for Mathematics
What this standard means
Students need to see three-digit numbers as groups of hundreds, tens, and ones. They should build, draw, read, and write numbers to 1,000 in several forms, including standard form, word form, and expanded form. They also need to count by 5s, 10s, and 100s, and compare numbers using place value.
Mastery looks like a student explaining that 407 means 4 hundreds, 0 tens, and 7 ones, not 47. Common trouble spots are zeros in the tens or ones place, mixing up digit value with the digit itself, and comparing numbers from left to right without checking place value.
Ways to teach it
- Have students build numbers like 236 and 304 with base-ten blocks, then trade tens for ones and hundreds for tens.
- Ask students to explain in writing how 520 and 502 are alike and different using hundreds, tens, and ones.
- Show five three-digit numbers and ask students to circle the greatest, underline the least, and justify one choice.
- Use a grocery receipt total or sports score list and have students order the amounts from least to greatest.
Plan a lesson for CCSS.Math.Content.2.NBT.A
Generate a complete lesson plan aligned to this standard, with objectives, activities, and materials. Free, no account needed.
Related standards
- CCSS.Math.Content.1.NBT.B
Understand place value.
- CCSS.Math.Content.4.NBT.A
Generalize place value understanding for multi-digit whole numbers.
- CCSS.Math.Content.5.NBT.A
Understand the place value system.
- CCSS.Math.Content.3.NBT.A
Use place value understanding and properties of operations to perform multi-digit arithmetic.