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Math Lesson 2.1.2 - Rounding to the Nearest Ten
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Welcome to our Math lesson on Rounding to the Nearest Ten, this is the second lesson of our suite of math lessons covering the topic of Rounding and Significant Figures, you can find links to the other lessons within this tutorial and access additional Math learning resources below this lesson.
Rounding to the Nearest Ten
When a number is rounded to the nearest ten it has at least one zero at the end. For example, 7 ≈ 10; 29 ≈ 30; 61 ≈ 60, etc.
We use the rounding to the nearest ten rule when estimating the approximate value of a small number of items. For example, we say "there are about 30 people in the bus", "there are about 40 walnuts in the box" and so on.
When a number ends with 0, it has no need to be rounded to the nearest ten. When a number ends with 1, 2, 3, 4, it becomes smaller after rounded to the nearest ten. For example, 1 becomes 0; 34 becomes 30; 51 becomes 50; 143 becomes 140; 15,472 becomes 15,470; etc.
On the other hand, when a number ends with 5, 6, 7, 8 and 9, it becomes bigger after it is rounded to the nearest ten. For example, 8 becomes 10; 67 becomes 70; 115 becomes 120; 1,479 becomes 1,480; etc. Let's look at a couple of examples:
A number rounded to the nearest ten, usually has one zero at the end. However, there are some cases when a number may have more than one zero after being rounded to the nearest ten. This occurs when the number is close to hundreds, thousands, etc. For example, 99 becomes 100; 204 becomes 200; 997 becomes 1,000; 10,002 becomes 10,000; etc.
The range of numbers that give the same rounding to the nearest ten is 10 numbers. For example, all numbers from 25 to 34 become 30 after being rounded to the nearest ten. These numbers are: 25, 26, 27, 28, 29, 30, 31, 32, 33 and 34.
More Rounding and Significant Figures Lessons and Learning Resources
Whats next?
Enjoy the "Rounding to the Nearest Ten" math lesson? People who liked the "Rounding and Significant Figures lesson found the following resources useful:
- Nearest Ten Feedback. Helps other - Leave a rating for this nearest ten (see below)
- Approximations Math tutorial: Rounding and Significant Figures. Read the Rounding and Significant Figures math tutorial and build your math knowledge of Approximations
- Approximations Video tutorial: Rounding and Significant Figures. Watch or listen to the Rounding and Significant Figures video tutorial, a useful way to help you revise when travelling to and from school/college
- Approximations Revision Notes: Rounding and Significant Figures. Print the notes so you can revise the key points covered in the math tutorial for Rounding and Significant Figures
- Approximations Practice Questions: Rounding and Significant Figures. Test and improve your knowledge of Rounding and Significant Figures with example questins and answers
- Check your calculations for Approximations questions with our excellent Approximations calculators which contain full equations and calculations clearly displayed line by line. See the Approximations Calculators by iCalculator™ below.
- Continuing learning approximations - read our next math tutorial: Upper and Lower Bounds. Intervals and Segments
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