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Rounding Numbers: Examples and Techniques Explained

MA.3.AR.1.2

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

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

MA.3.AR.2.1

Relating Addition with Division

MA.3.AR.2.3

Identifying the Missing Digits (Addition)

Fill in the Blank — Up to 1000

Identifying the Missing Digits (Subtraction)

MA.3.AR.3.1

Even and odd numbers

Recognizing Even Numbers

Recognizing Odd Numbers

MA.3.FR.2.1

Comparing and Ordering Fractions

Comparing Fractions

Ordering Fractions

MA.3.FR.2.2

Equivalent fractions

Equivalent Fractions

MA.3.NSO.1.1

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

Reading and Writing Digits

Reading and Writing Digits — Up to 20

Reading and Writing Digits — Up to 99

MA.3.NSO.1.2

Converting Between Place Values of Multi-Digits

Conversions To and From — Up to 9999

Regrouping Place Values of Multi-Digits

Place Values Regrouping — Up to 999

MA.3.NSO.1.3

Place Value Tables of Multi-Digits

Place Value Tables — Multi-Digit

Comparing Values of Multi-Digits

Place Value Comparing Numbers — Up to 999

MA.3.NSO.1.4

Rounding numbers

Rounding Decimals

Rounding Integers — Up to 9999

MA.3.NSO.2.1

Adding with Digits Up to 1000

Add By Digits — Up to 1000

Addition with Regrouping Up to 1000

Add By Regrouping — 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

MA.3.NSO.2.2

Times Tables

Multiplication Times Table — Up to 2 Digits

Multiplying with Digits Up to 999

Multiplication by Digits — Up to 3 Digits

Relating Multiplication with Division Up to 999

Relating Multiplication with Division

MA.3.NSO.2.3

Multiplying Digits with 5 and 10 Up to 999

Multiplication by Five or Ten — Up to 100

MA.3.NSO.2.4

Multiplication Tables Up to 999

Multiplication Tables — Up to 100

Multiplication Tables — Up to 200

Dividing with Digits Up to 999

Division By Digits — Up to 3 Digits

Division Tables Up to 999

Division Tables — Up to 100

Division Tables — Up to 200

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