Adding Decimals Using a Number Line

This lesson teaches how to represent decimal addition on a number line. It starts with a number line from 0 to 1, divided into 10 parts, each representing 1/10. The video demonstrates adding 3/10 and 5/10, resulting in 8/10. It then shows adding 8/10 and 4/10, requiring an extension of the number line to 2, resulting in 1 and 2/10. The lesson concludes with a summary of the concepts covered.

What is the purpose of dividing the number line into tenths?

• To represent fractions as decimals

• To create a visual representation of subtraction

• To simplify multiplication

• To make it easier to count whole numbers

When adding 3/10 and 5/10 on a number line, where does the arrow end?

• At 9/10

• At 5/10

• At 7/10

• At 8/10

Why do we need to extend the number line beyond 1?

• To accommodate sums greater than 1

• To subtract decimals

• To divide decimals

• To add numbers less than 1

What is the sum of 8/10 and 4/10 when represented on an extended number line?

• 1 and 1/10

• 1 and 4/10

• 1 and 2/10

• 1 and 3/10

How do you represent the addition of decimals on a number line?

• By moving to the left of the plotted point

• By moving to the right of the plotted point

• By jumping over the plotted point

• By staying at the plotted point