# Grade 3 Math Number and Operations

## 3rd Grade Math Number and Operations

3rd grade covers both Number and Operations in Base Ten and Number and Operations – Fractions.

Many years ago when I taught third grade I enjoyed teaching fractions.  It’s one of those skills where you can see students really “light up” when they start to understand the concept.

Here are the standards and some videos to explain the concepts.  I hope you find this helpful.

CCSS.MATH.CONTENT.3.NTB.A.1| Use place value understanding and properties of operations to perform multi-digit arithmetic.

Use place value understanding to round whole numbers to the nearest 10 or 100.
Standards: 3.NTB.A.1

CCSS.MATH.CONTENT.3.NTB.A.2| Use place value understanding and properties of operations to perform multi-digit arithmetic.

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

Standards: 3.NTB.A.2

CCSS.MATH.CONTENT.3.NTB.A.3| Use place value understanding and properties of operations to perform multi-digit arithmetic.

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.

Standards: 3.NTB.A.3

CCSS.MATH.CONTENT.3.NF.A.1| Develop understanding of fractions as numbers.

Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b.

Standards: 3.NF.A.1

CCSS.MATH.CONTENT.3.NF.A.2| Develop understanding of fractions as numbers.

Understand a fraction as a number on the number line; represent fractions on a number line diagram.

Standards: 3.NF.A.2

CCSS.MATH.CONTENT.3.NF.A.3| Develop understanding of fractions as numbers.

Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.

Standards: 3.NF.A.3