Discuss what tenths and hundredths are with your students. A tenth is written as 0.1 and fits 10 times into 1.0. A hundredth is written as 0.01 and it fits 100 times into 1.0. Check that students understand this by asking questions. How do you say 0.7 and 0.05? Show the different parts of a decimal number and use a decimal place value chart. Show, using steps on a number line, how you can divide a decimal number into different parts. The decimal number of 12.53 can be split into 10.00 + 2.00 + 0.50 + 0.03. Discuss the value of the digits in the decimal number: The 1 represents 1 tens, and has the value of 10.00. The 2 represents 2 ones and has a value of 2.00. The 5 represents 5 tenths and has a value of 0.50. The 3 represents 3 hundredths and has a value of 0.03. Practice setting decimal numbers into the decimal place value chart together with the students, how to read the decimal numbers using the decimal place value chart, and filling in the missing number in a decimal place value chart using the number line.
Check that students understand how to build decimal numbers with 1 or 2 decimals by asking the following questions:
- How many tenths does 4.9 have?
- Is the 3 a tenth or a hundredth in the number 2.3?
- What is 3.00 + 0.50 + 0.09?