Estimation

Estimate the Sum with Rounding

How do you estimate the sum?

(hundreds place)

• If the equation is..... 234 + 641

• First, round both numbers to the nearest hundred and rewrite the equation

• 234 rounds down to 200

• 641 round down to 600

• The new equation is 200+600. We know that equals 800!

Multiple Choice

What is 234 rounded to the nearest hundred?

• 300

• 200

• 100

• 230

Multiple Choice

What is 457 rounded to the nearest hundred?

• 400

• 500

• 460

• 1,000

Poll

Do you feel that you need more practice with rounding in the hundreds?

• Yes

• A little bit

• No

Multiple Choice

Estimate the sum! What would be the new equation be when we round in the hundreds place?

$$432+289$$  

• 500+200

• 400+300

• 700+100

Multiple Choice

Estimate the sum! What would be the new equation be when we round in the hundreds place?

$$312+734$$  

• 300+700

• 200+700

• 300+800

Multiple Choice

Estimate the sum! First round in the hundreds place, then solve!

$$275+725$$  

• 300+700= 1,000

• 200+700= 900

• 300+800= 1,000

Multiple Choice

Estimate the sum! First round in the hundreds place, then solve!

$$89+867$$  

• 200+900= 1,100

• 100+900= 1,000

• 0+900= 900

Great job!

If you made a mistake, it means you're learning! Yay!