# Rounding Numbers To The Nearest 100

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Level: Primary 4 / Primary 5 / Grade 4 / Grade 5

Learn the complete process of teaching your child to round off numbers to the nearest hundred.

The first step is to make sure your child knows how to count by 50's.

The next step is to see if your child knows where a given number falls within the number line.  They must have a general idea of where the number should go; they must know how to compare numbers.

Now your child is ready for the next step. Ask your child a question like " Is 244 closer (nearer) to 200 or 300 on the number line"?

They should be able to draw a number line with suitable numbers on it to help them figure out the answer.

Now you can use the terms Round Off.

When your child has understood the process of rounding a number, we can use a short cut.

I will use the number 7089 to illustrate.
Underline the last 3 digits - 7089.

The digit 0 is in the hundreds place, so 7089 will become either 7000 or 7100 after rounding off to the nearest hundred.

We draw a number line with 3 numbers on it: 7000, 7050 and 7100.

Ask ourselves "Is 7089 smaller than or bigger than 7050 ?" (is it to the left or to the right of 7050).

If it is smaller than 7050, we round it off to 7000 (round down).
If it is 7050 or bigger, we round it off to 7100 (round up).

Since 7089 is bigger than 7050, we round it up to 7100.

Tip

When you want to round off a number, underline the digits starting from the place you want to round off to. This makes it easier for your child to see the relevant digits to change.

Round off to nearest ten - underline last 2 digits
Round off to nearest hundred - underline last 3 digits
Round off to nearest thousand - underline last 4 digits
Round off to nearest ten thousand - underline last 5 digits
.... and so on

If your child can understand this question, he is ready ace his exam:

What is the smallest number that rounds off to 4570 when rounded off to the nearest ten?

Check: If we round off 4564 (a number that is 1 smaller than our answer) to the nearest ten, we get 4560, not 4570.

Here are a few more:

1. What is the largest number that rounds off to 1090 when rounded off to the nearest ten?

2. What is the smallest number that rounds off to 300 when rounded off to the nearest hundred?

3. What is the biggest number that rounds off to 10,000 when rounded off to the nearest thousand?

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