2.05 Estimation first
Lesson
Are you ready?
Do you remember how to round numbers? Give this problem a try.
Round $54$54 to the nearest ten.
Learn
Let's see how we can estimate the answer to an addition problem by rounding the numbers first.
Apply
Choose the right answer.
$143+33$143+33 will be in the:
$100$100s
A$200$200s
B
Remember!
We can use number lines to help when rounding numbers. By putting the number in our question on a number line, we can see the closest number. Once we round the numbers in our question, we can then add them together to get an estimate of our answer.