Adding Decimals Using a Number Line

This lesson teaches how to add decimals using a number line. It begins with a review of number lines and their use in representing whole numbers and fractions. The lesson then explains how to relate fractions and decimals to money for easier understanding. Common mistakes in marking fractions on a number line are discussed. A practical problem involving decimal addition is solved using a number line, with a focus on making smart estimates and visualizing the process step-by-step.

What is a practical way to relate fractions and decimals to a number line?

• Using a ruler

• Thinking about money

• Counting on fingers

• Using a calculator

What is a common mistake when marking fractions on a number line?

• Using too many fractions

• Starting from the wrong end

• Marking fractions in the same way

• Using different size pieces for each fraction

What is the first step in solving the problem of adding 1.5 and 2.25?

• Drawing a number line

• Making a smart estimate

• Using a calculator

• Converting to fractions

When adding decimals on a number line, what should you do after marking the whole numbers?

• Mark the halves and fourths

• Add the decimals directly

• Estimate the result

• Convert to fractions

What is the final sum of 1.5 and 2.25 when added on a number line?

• 3.75

• 3.5

• 4.0

• 3.25