| Rounding decimals 2 | |
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| Description | |
| Exercise Name: | Rounding decimals 2 |
| Math Missions: | 5th grade (U.S.) Math Mission |
| Types of Problems: | 4 |
The Rounding decimals 2 exercise appears under the 5th grade (U.S.) Math Mission. This exercise provides various methods to better understand rounding decimals and whole numbers to particular sizes.
Types of Problems[]
There are four types of problems in this exercise:
- Select the numbers that round as specified: This problem provides a number that is supposed to be the result after rounding. The student is asked to select all of the options from a multiple select list that round to that number.
Select the numbers that round as specified
- Round to different places: This problem provides a number line and a dot at a particular place. The student is asked to round the number in two different ways.
Round to different places
- Select the correct dot and round it: This problem provides a number line, a number, and several dots. The student is asked to select that dot the correct labels the given point and then round it as requested.
Select the correct dot and round it
- Move the for to the correct spot and round it: This problem has a manipulative and provides a number. The student is to move the orange dot to the spot requested and then round it appropriately.
Move the dot to the correct spot and round it
Strategies[]
Knowledge of the place values and naming conventions can help to perform this exercise accurately and efficiently.
- When rounding, if the next number is 5 or larger round up. Otherwise, round down.
- It is not unreasonable to round all numbers in the "Select numbers that round as specified problem. It is sometimes more efficient then trying to see which ones round correctly.
- The Round to different places problem has only shown ones and tens in research and practice, but could be expanded easily.
Real-life Applications[]
- All the sciences require rounding to significant digits or significant figures. This exercise helps to develop and understand the geometric foundation of rounding.
- Decimals are very common in shopping. Price tags, food labels, and receipts all contain decimals.
- At gas pumps, decimals are used to show how much gas is pumped and much it costs per gallon.