CCSS.Math.Content.1.NBT.B
The standard
Understand place value.
Common Core State Standards for Mathematics
What this standard means
Students need to see two-digit numbers as tens and ones, not just a string of digits. They should build numbers with ten-sticks and ones, say what each digit means, count by tens and ones, and compare numbers using place value.
Mastery looks like a student building 47 as 4 tens and 7 ones, explaining that 52 is greater than 49 because 5 tens beats 4 tens, and regrouping ten ones as one ten. Common trouble spots are reading 30 as 3 ones, comparing only the ones digit, and counting after a decade number like 59 or 70.
Ways to teach it
- Have students build number cards with base-ten blocks, then trade ten ones for one ten whenever they can.
- Ask, “Which is greater, 64 or 46, and how do you know without counting all?”
- Show 38 with blocks and ask students to write the number, draw it, and label tens and ones.
- Use classroom collections, like 27 crayons, to bundle groups of ten and count leftovers as ones.
Plan a lesson for CCSS.Math.Content.1.NBT.B
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Related standards
- CCSS.Math.Content.2.NBT.A
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.