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Rounding Numbers: Examples and Techniques Explained

NY.3.MD.5

Introduction to surface area of 3-dimensional shapes

NY.3.MD.6

Area - unit squares and pattern blocks

Area by Unit Squares

NY.3.MD.7

Square measure

Converting Square Units

Calculate the Square Area

NY.3.MD.8

Perimeter: Grid squares and polygons

Perimeter of Polygons

Perimeter Equation of Polygons

NY.3.NBT.1

Addition using Estimation

Add By Estimation — Up to 1000

Subtraction using Estimation

Subtract By Estimation — Up to 1000

Rounding numbers

Rounding Decimals

Rounding Integers — Up to 9999

NY.3.NBT.2

Adding with Digits Up to 1000

Add By Digits — Up to 1000

Adding with Doubles Up to 1000

Adding Doubles — Up to 1000

Simplifying Addition by Making 10s

Making Tens to Add

Addition with Tens and Ones

Adding By Tens — Up to 1000

Simplifying Addition by Separating

Addition by Separation — Up to 1000

Addition by Separation — Up to 999

Addition with Regrouping Up to 1000

Add By Regrouping — Up to 1000

Addition Tables Up to 1000

Add By Number Table — Up to 1000

Subtracting with Digits Up to 1000

Subtract By Digits — Up to 1000

Subtraction with Regrouping Up to 1000

Subtract with Regrouping — Up to 1000

NY.3.NBT.4

Place Value Tables of Multi-Digits

Place Value Tables — Multi-Digit

Identifying the Place Value of a Digit

Place Value of a Digit — Multi-Digits

Expanded Form of Multi-Digits

Place Values in Expanded Form — Up to 10K

Place Values in Expanded Form — Up to 999

Converting Between Place Values of Multi-Digits

Conversions To and From — Up to 9999

Reading and Writing Digits

Reading and Writing Digits — Up to 20

Reading and Writing Digits — Up to 99

Comparing Values of Multi-Digits

Place Value Comparing Numbers — Up to 999

Regrouping Place Values of Multi-Digits

Place Values Regrouping — Up to 999

Place Value Word Problems of Multi-Digits

Place Value Word Problems — Up to 10K

Place Value Word Problems — Up to 999

NY.3.NF.3

Equivalent fractions

Equivalent Fractions

NY.3.OA.1

Multiplying Digits with 5 and 10 Up to 999

Multiplication by Five or Ten — Up to 100

Multiplying Digits with 0 and 1 Up to 999

Multiplication by One or Zero — Up to 999

Times Tables

Multiplication Times Table — Up to 2 Digits

Using Models to Multiply Up to 999

Multiplication by Models — Up to 3 Digits

Multiplying using Mental Strategies

Split into Smaller Calculations Strategy — Up to 999

Repeated Addition As Multiplication Up to 999

Multiplication by Repeated Addition — Up to 999

NY.3.OA.2

Sharing & Grouping Up to 999

Sharing and Partitioning — Up to 3 Digits

Dividing with Arrays

Dividing with Arrays — Up to 100

Remainders from Division Up to 999

Sharing and Remainders — Up to 3 Digits

Dividing with Digits Up to 999

Division By Digits — Up to 3 Digits

Relating Multiplication with Division Up to 999

Relating Multiplication with Division

Understanding the Division Sign Up to 999

Division Language — Divided By

Division Language — Sharing

NY.3.OA.3

Multiplication Word Problems Up to 999

multiplication word problems up to 999

Division Word Problems Up to 999

Division Word Problems — Up to 3 Digits

NY.3.OA.4

Identifying the Missing Digits (Addition)

Fill in the Blank — Up to 1000

Identifying the Missing Digits (Subtraction)

Multiplication Tables Up to 999

Multiplication Tables — Up to 100

Multiplication Tables — Up to 200

Division Tables Up to 999

Division Tables — Up to 100

Division Tables — Up to 200

NY.3.OA.6

Relating Addition with Division

NY.3.OA.7

Multiplying with Digits Up to 999

Multiplication by Digits — Up to 3 Digits

Multiplying with 3 Numbers Or More

Multiplication of Three or More Numbers

NY.3.OA.8

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Applications of the four operations (BEDMAS without exponents)

Combining Multiplication and Addition

Applying BEDMAS Without Exponents

Addition Word Problems Up to 1000

Addition Word Problems — Up to 1000

Addition Word Problems — Up to 200

Subtraction Word Problems Up to 1000

Subtraction Word Problems — Up to 1000

3rd Grade Math

math

Ex.1

Ex.2

Ex.3

Ex.4

Intro

In this section, we will be using our knowledge about the place value system to round both whole numbers and decimal numbers. Say your curfew is 10:00pm. You are running a bit late and you arrive home at 10:02pm, 2 minute past your curfew. You could round that time to 10:00pm. Phew, thank goodness for rounding!  When rounding numbers, we first focus on the digit in the place we are asked to round. Those digits to the left of this place are left alone. The digit we are focusing on is also left alone if the next digit to the right is less than 5; however, the digit we are focusing on is increased by 1 if the next digit to the right is 5 or more.

Rounding Numbers

Rules and examples for rounding numbers

Place value

Comparing and ordering numbers