Subtracting Mixed Numbers

Mrs. C explains how to subtract mixed numbers with different denominators. She demonstrates writing the problem vertically, finding a common denominator, renaming fractions, subtracting numerators and whole numbers, and simplifying the result. The video provides a step-by-step guide to ensure students understand each part of the process.

What is the first step in subtracting mixed numbers with different denominators?

• Multiply the numerators by the denominators.

• Add the fractions together.

• Subtract the whole numbers first.

• Find a common denominator for the fractions.

How can you find a common denominator if it's not immediately obvious?

• Subtract the smaller denominator from the larger one.

• Divide the larger denominator by the smaller one.

• Add the denominators together.

• List the multiples of each denominator until a common one is found.

When renaming fractions with a common denominator, what must you do to the numerator?

• Subtract the same number from the numerator.

• Multiply the numerator by the same factor as the denominator.

• Add the same number to the numerator.

• Divide the numerator by the same factor as the denominator.

After finding a common denominator, what is the next step in subtracting mixed numbers?

• Divide the fractions.

• Multiply the fractions together.

• Subtract the numerators and keep the denominator the same.

• Add the whole numbers.

What should you do if the fraction part of your answer is improper or can be simplified?

• Add one to the whole number.

• Simplify it by finding common factors.

• Convert it to a decimal.

• Leave it as it is.