Course Sample for Our Strengthening Skills with Fourth Grade Math Homeschool Course
Rounding Numbers to the Nearest Tens
In this lesson, we will learn how to round numbers to the nearest tens. Rounding a number is simply making the number easier to use but keeping it as close as possible. For example, the number 10 is very easy to use. It is easy to add it, subtract it, multiply it, and even divide it. The number 14, however, is not that easy to use. So, if we say that 14 is close to 10 and use the 10 instead, we make things easier.
There are some steps to rounding numbers to make sure that your rounded numbers stay close to the original number. Here are the steps with an example of each step.
- The first thing you must pay attention to is to what place the number is to be rounded. In this lesson, we are only rounding to the tens place, but that will not always be the case. For example, round 26 to the nearest tens. Notice it says to the tens place.
- Find the digit that is in that place and underline it, then look at the digit to the right of it. The 2 is in the tens place, so we look to the right at the ones place.
- Decide if that digit (the one on the right) is less than 5 or 5 or greater. The digit in the ones place is a 6, so it is greater than 5.
- If the digit is less than 5, then you leave the digit that is being rounded the same as it is. However, if the digit on the right is 5 or greater, the digit being rounded goes up to the next digit. Since the 6 is greater than 5, we round the 2 up to a 3 and say that 26 rounds to 30.
Let’s do some problems together. Round the following numbers to the nearest tens.
34 = to round 34 to the nearest tens, we underline the 3. Then look at the 4 and decide that it is less than 5. Therefore, we round down to 30.
85 = to round 85 to the nearest tens, we underline the 8. Then look at the 5 and decide that it is 5 or greater. Therefore, we round up to 90.
Now try to do the following problems on your own. Round the following numbers to the nearest tens.
43 = _______
48 = _______
17 = _______
35 = _______
The answers for the problems you just did are in the answer key. If you got any wrong, try to figure out why it was wrong before you move on to the next section.
Here are more numbers to round to the nearest tens. Write the answer on the line after the number.
84 = _______
27 = _______
38 = _______
69 = _______
13 = _______
41 = _______
92 = _______
56 = _______
75 = _______
Good job! In the next lesson, we will learn how to round bigger numbers.
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