Estimation, Approximation and Rounding

Multiple Choice

• cheese sandwich

• cheese bread

• cheeseburger

• cheese ball

Multiple Choice

• star apple

• green apple

• pineapple

• green mango

Let's listen!

Let's put on our thinking caps!

Estimation, Approximation and Rounding off

by Ms. Smith

​By the end of this lessons

• Use place value understanding to approximate whole numbers to the nearest 10, 1​00, 1000 and 10,000

Estimation

In maths, estimation means having a rough calculation of the value, number, quantity or extent of something.  ​

​Let us imagine

​

Mom sends you to the shop...

​

Is estimation involved?

Can you remember a time you used estimation?

Is there a difference between Estimation and Approximation?

​

​We can describe estimation as an educated guess. While approximation is a value or quantity that is very similar, but not exactly correct.

​

​Approximation is the process of using rounding to determine a fairly accurate value.

​

Rounding off is the process of making a number less exact, but easier to work with, by rounding off to a specific digit.

​

​

How can we approximate numbers?

​

​Rounding off using the number line

​

Multiple Choice

Look at the number line.

Number 77 is nearest to ....

• 70

• 80

• 90

• 100

Multiple Choice

Look at the number line.

Number 84 is nearest to ....

• 80

• 90

• 100

• 70

Multiple Choice

If you do rounding off the number 380 will be ...

• 300

• 320

• 350

• 400

Rounding Whole Numbers

Let's review Place Value

Each digit in a number has it's own value that is based off the location of the digit in the number.

Multiple Choice

Write the missing place value heading.

• thousands

• hundreds

• tens

• ones

Multiple Choice

What place value is the 2 in, in the number 624

• Ones

• Tens

• Hundreds

• Thousands

Multiple Choice

Which number has a 8 in the hundreds place?

• 768

• 968

• 872

• 381

Multiple Choice

Round the number 87 to the nearest tens.

• 80

• 85

• 90

Multiple Choice

Round 302 to the nearest hundreds place.

• 300

• 310

• 400

Multiple Choice

Round 1,245 to the nearest THOUSANDS place.

• 1,000

• 1,200

• 1,250

• 2,000

• Are you ready to practise?

Multiple Choice

Round 6,993 to the nearest TENS place.

• 6,000

• 6,900

• 6,990

• 7,000

Multiple Choice

Round 5,643 to the nearest HUNDREDS place.

• 5,000

• 5,600

• 5,700

• 6,000

Multiple Choice

Which of the following numbers will NOT round to 400 when rounding to the nearest hundred?

• 409
• 445
• 345
• 398

Multiple Choice

Tyler says 753 rounds to 800.  Alexis says 753 rounds to 750.  Who is correct?

• Tyler
• Alexis
• Both of them are right

• Niether of them are right

Open Ended

Why did you choose that answer? 

​Let's recap!

​

​Homework:

Exercise 1Q 2, 4, 6, 7, 8

​Exercise 1R 1, 2, 3

Open Ended

EXIT TICKET

When is the homework due, be specif as possible?