Do you remember how to round numbers ?
The number 379 is plotted on the number line.
Round 379 to the nearest 100 and plot it on a number line.
To round a number to the nearest 100, plot it on a number line and choose the multiple of 100 that it is closest to.
Let's see how we can estimate the answer to a subtraction problem, and an addition problem.
We want to estimate the answer to 258-26.
Round each of the two numbers to the nearest and then subtract them.
Find the value of 258-26.
If we don't need an exact answer to a problem, we can use estimating to find out a close-enough answer. We can also use estimating to check our answers, so it is a great skill to learn.