CCSS.Math.Content.2.NBT.A.1

Math2nd Grade

The standard

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:

Common Core State Standards for Mathematics

What this standard means

Students need to see a three-digit number as groups of hundreds, tens, and ones. They should connect the digit’s place to its value, so 4 in 482 means 4 hundreds, not just 4.

Mastery looks like building, drawing, saying, and writing numbers in expanded form, including numbers with a zero in the tens or ones place. Students often mix up the digit and its value, or ignore zero as a placeholder.

Ways to teach it

Have students build 306, 360, and 36 with base-ten blocks, then label each with hundreds, tens, and ones cards.
Ask students to write: How are 507 and 570 the same, and how are they different?
Show 684 with place value disks, then ask students to write the number, expanded form, and word form on a whiteboard.
Use a grocery receipt total like $248 and discuss what each digit means in dollars, tens of dollars, and hundreds of dollars.

Plan a lesson for CCSS.Math.Content.2.NBT.A.1

Generate a complete lesson plan aligned to this standard, with objectives, activities, and materials. Free, no account needed.

Generate a lesson plan Chat about this standard

Related standards

CCSS.Math.Content.1.NBT.B.2
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
CCSS.Math.Content.2.NBT.A.1b
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).
CCSS.Math.Content.5.NBT.A.1
Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represen...
CCSS.Math.Content.2.NBT.A.4
Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.