Rounding, Estimation, Addition

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, usually to the nearest ten, hundred, or other place value.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

How do you round a number to the nearest ten?

Back

To round a number to the nearest ten, look at the digit in the ones place. If it is 5 or more, round up. If it is 4 or less, round down.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Round the number 56 to the nearest 10.

Back

60

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

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 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 to make calculations easier.

Front

Why is estimation useful?

Back

Estimation is useful because it helps to quickly assess the size of a number or the result of a calculation without needing exact figures.

Front

What is an open number line?

Back

An open number line is a visual tool used to help with addition and subtraction, where numbers are represented on a line without specific markings.

Tags

CCSS.2.NBT.B.7

Front

Solve using an open number line: 236 + 127 = ?

Back

363

Tags

CCSS.2.NBT.B.7