Place value- recognizing and writing decimal numbers
Place value- recognizing and writing decimal numbers
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General
Students learn to write and say decimal numbers with two decimal places (hundredths)
Common core standard
4.NF.C.5
4.NF.C.6
Relevance
It is important that students know how to say decimal numbers, so they better understand how decimal numbers work. An example would be reading a newspaper article in which it states "The world record for the 200 meter sprint has been broken by 3 hundredths of a second!".
Introduction
Start with an exercise in which students must match a price to an article of clothing. Then have students link the decimal number with the names quarter, half, and three quarters.
Development
The decimal number 0.1 is called a tenth. You can fit it 10 times into one whole. You show this on the number line and with MAB-blocks. The decimal number 0.01 is called a hundredth. You can fit it 100 times into one whole. You show this on the number line and with MAB-blocks. Tell students that you say 0.11 as eleven hundredths, and 0.26 as twenty-six hundredths. You take the name of the last number.
Check that students know how to say decimal numbers with hundredths by asking the following questions:
- How do you say 0.8? And 0.07? And 0.99?
- What are the different ways to say 0.75? (three quarters or seventy-five hundredths)
Guided practice
The students start with three listening exercises. They hear a decimal number spoken aloud and must match it to the numbers given.
Closing
Ask students when they might talk about hundredths. It is a very small part, but can make a lot of difference. An example is during a race with many runners, or in setting a world record for a swimming competition. Use the exercise to check that students have understood what hundredths are and how to say them. Ask students to match decimal numbers to their written form.
Finally set students in groups and give each group a stopwatch. Have the groups come up with a quick activity (saying a list of words, standing up and sitting down in their chairs ten times, saying the 6 times table out loud) and have them time themselves. Have them say the amount of hundredths showing on the stopwatch.
Teaching tips
Make sure to repeat often that decimal numbers can be said in multiple ways. Make clear to students that there is no difference between 0.25 and one quarter and twenty-five hundredths.
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