Rounding Using a Number Line

Rounding with a Vertical Number line

​Obj: Round whole number to a given place value through the hundred thousand places


DOL: Students will take an exit ticket that focus on round whole numbers to a given place value through the hundred thousand place 8 out of 10 times correctly

Rounding

Rounding number is the process of approximating the number to its closest value. It involves reducing the number of significant digits while retaining the general magnitude or size of the original number. The result of rounding is less accurate than the original number but simplifies calculations.

• If the next digit to the right is 5 or greater, increase the rounding digit by 1 and everything to the back of the rounded digit turns into a zero

• Identify the rounding digit

• If the next digit to the right is less than 5, keep the rounding digit the same, and every number to the right turns into zero.

​Rules

Rules of Rounding

Multiple Choice

If you round 537 to the nearest hundred, What would be the bottom number on the number line?

• 600

• 500

• 400

• 530

537

Our number has a 5 in the hundreds place. That means it is at least 500 but less than 600

Multiple Choice

If you round 537 to the nearest hundred, what would be on the top number on the number line?

• 600

• 500

• 400

• 530

537

Our number has a 5 in the hundreds place. That means it is at least 500 but less than 600

4,294

There are 4,294 students at Sparter Middle School. About how many students is that?

Multiple Choice

If I round the number 4,294 to the nearest thousand, what number would be at the top of my vertical number line?

• 4,000

• 5,000

• 6,000

• 3,000

4,294

We have 4 thousands in our number.

That means our number is more than 4,000 but less than 5,000.

Multiple Choice

When rounding 4,294 to the nearest thousand, what is the halfway point on our vertical number line?

• 4,005

• 4,050

• 4,500

• 5,400

Multiple Choice

What does 4,294 rounded to the nearest thousand round to?

• 5,000

• 4,000

Round down

4,294 is less than halfway to 5,000, so it will round to about 4,000.