CCSS.Math.Content.3.NBT.A

CCSS.Math.Content.3.NBT.A is a cluster heading. These are the individual standards under it.

• CCSS.Math.Content.3.NBT.A.1

  Use place value understanding to round whole numbers to the nearest 10 or 100.

• CCSS.Math.Content.3.NBT.A.2

  Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition a...

• CCSS.Math.Content.3.NBT.A.3

  Multiply one-digit whole numbers by multiples of 10 in the range 10—90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations...

01

What Students Need to Do

Students use hundreds, tens, and ones to round numbers and solve addition and subtraction problems within 1,000. They also multiply one-digit numbers by multiples of 10 and explain their methods.

02

What Mastery Looks Like

Students choose an accurate method, line up place values, and regroup correctly. They can explain why their answer makes sense using place value, estimation, or an inverse operation.

03

Common Misconceptions

Students may round by looking at the wrong digit or always rounding up. They may regroup without tracking place value, or treat 6 × 40 as 6 × 4.

04

How to Assess It

Give students four items: round 347 to the nearest ten, round it to the nearest hundred, solve 468 + 257, and solve 6 × 40. Ask them to show one place value step for each.

1. 01

   Have students build 326 and 487 with base ten blocks, combine them, and record each regrouping as an addition step.

2. 02

   Ask students to explain whether 650 rounds to 600 or 700, using a number line or place value reasoning.

3. 03

   Play a card game where students draw three digits, form two numbers, then add, subtract, or round them for points.

4. 04

   Give a classroom supply order with item bundles of 10, then have students find totals such as 7 packs of 30 pencils.

• CCSS.Math.Content.1.NBT.C

  Use place value understanding and properties of operations to add and subtract.

• CCSS.Math.Content.4.NBT.A

  Generalize place value understanding for multi-digit whole numbers.

• CCSS.Math.Content.4.NBT.B

  The 4th Grade version of this standard.

• CCSS.Math.Content.2.NBT.B

  Use place value understanding and properties of operations to add and subtract.