Rounding, Estimation, Addition

Front

What does it mean to round a number?

Back

Rounding a number means adjusting it to the nearest place value (like tens, hundreds) to make it simpler to work with.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

How do you round a number to the nearest 10?

Back

Look at the digit in the ones place. If it's 5 or more, round up. If it's 4 or less, round down.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Round 467 to the nearest 100.

Back

500

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Round 345 to the nearest 10.

Back

350

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What is estimation in math?

Back

Estimation is finding a number that is close enough to the right answer, often used for quick calculations.

Front

How do you estimate the sum of two numbers?

Back

Round each number to a convenient value and then add those rounded numbers.

Front

Solve: 145 + 35 using an open number line.

Back

180

Tags

CCSS.2.NBT.B.7

Front

Round the number 134 to the nearest 10.

Back

130

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Round the number 82 to the nearest 10.

Back

80

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What is an open number line?

Back

An open number line is a blank line where you can mark numbers and visualize addition or subtraction.

Tags

CCSS.2.NBT.B.7