Math Example--Decimal Concepts--Subtracting Decimals: Example 3

Topic

Decimals

Description

This example demonstrates the process of subtracting decimals with regrouping. The problem presented is 2.8 - 1.9. The solution involves borrowing (regrouping) from the units place, effectively turning 2.8 into 1.18. By following this method and aligning the decimal points, students can solve the problem and arrive at the correct answer of 0.9.

Subtracting decimals is a crucial skill in mathematics that builds upon students' understanding of place value, basic arithmetic operations, and the concept of regrouping. This collection of examples helps teach the topic by providing clear, step-by-step visual representations of the subtraction process, including cases where regrouping is necessary. Students can observe how to align decimal points, perform the subtraction column by column, and handle more complex scenarios.

Presenting multiple worked-out examples is essential for students to fully grasp the concept of decimal subtraction, especially when regrouping is involved. Each example in this collection showcases different scenarios, from simple subtractions to more complex ones requiring regrouping. By exposing students to various problem types, they can develop a comprehensive understanding of the process and gain confidence in their ability to subtract decimals accurately, even in more challenging situations.

Teacher's Script: Now, let's look at our third example of subtracting decimals, which involves regrouping. We have 2.8 minus 1.9. Remember to line up the decimal points. In this case, we can't subtract 9 tenths from 8 tenths, so we need to regroup. We borrow 1 from the 2 in the ones place, making it 1, and add 10 tenths to the 8 tenths, making it 18 tenths. Now we can subtract: 18 tenths minus 9 tenths equals 9 tenths. In the ones column, 1 minus 1 equals 0. So, our final answer is 0.9. Always remember, regrouping works the same way with decimals as it does with whole numbers!

For a complete collection of math examples related to Subtract Decimals click on this link: Math Examples: Subtracting Decimals Collection.