In Unit 1, fifth graders will learn about decimal numbers and extend place value understanding to the thousandths place. They will represent decimal numbers in different ways, such as written form, standard form, and expanded form. Fifth graders will primarily work on addition and subtraction of decimal numbers to the hundredths place. Students will use a variety of strategies to solve the problem. The solution methods range from using concrete models or drawings to strategies based on place value, meanings of operations, and number sense. In addition, students will be guided on how to solve addition and subtraction of decimal numbers using the standard algorithm. Students will understand why this method works and will apply this strategy to solve problems efficiently. Children go through different phases to quickly and accurately solve addition and subtraction problems. Unit 1 will primarily focus on phases 2 and 3.
There are a variety of strategies to help solve addition and subtraction problems involving decimal numbers. The type of strategy depends on types of numbers used in the problem. The handout below gives an explanation of the different types of strategies.
Check out the videos below to see the math strategies in action. Most of the explanations are from students from our district. Thank you to the students for volunteering to explain their thinking!
There are several ways to have your child practice the math concepts at home. Try the following activities: