Rounding Numbers Lesson Topic Index | Grade 4 Math | Elementary Test Prep | StudyZone

You can round numbers to tell about how much or about how many.
Rounding is one way to estimate.

To round numbers:

• Find the place you are rounding to.

• Look at the digit to its right.

If the digit to the right of the place one is rounding to is
less than 5, round down    ;
if it is 5 or greater, round up
.

 Example 1: Round 1,754 to the nearest thousand 1,754  >>> 1 is in the thousands place. Look to the right of the 1 and notice that there is a 7. 7 is "5 or higher", so the 1 increases by 1  and becomes a 2. All the other numbers to the right of the 2 now become Zeros. Meaning: 1,754 rounds UP to 2,000 Example 2: Round 32,795 to the nearest ten-thousand 32,795  >>> 3 is in the ten-thousands place. Look to the right of the 3 and notice that there is a 2. 2 is NOT "5 or higher", so the 3 STAYS as it is. All the other numbers to the right of the 3 now become Zeros. Meaning: 32,795 rounds DOWN to 30,000 Example 3: Round 958 to the nearest hundred 958  >>> 9 is in the hundreds place. Look to the right of the 9 and notice that there is a 5. 5 is a "5 ", so the 9 increases by 1  and becomes a 10. All the other numbers to the right of the 10 now become Zeros. Meaning: 928 rounds UP to 1,000

Let's Practice!