Lesson

Do you remember how to round numbers ? Give this problem a try.

Round 54 to the nearest ten.

Worked Solution

Idea summary

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.

Let's see how we can estimate the answer to an addition problem by rounding the numbers first.

Choose the right answer.

143 + 33 will be in the:

A

100s

B

200s

Worked Solution

Idea summary

Once we round the numbers in our question, we can then add them together to get an estimate of our answer.