Dividing Fractions and Reciprocals

Mrs. Nelson explains how to divide numbers by unit and non-unit fractions using diagrams and reasoning. She introduces the concept of reciprocals, showing that dividing by a fraction is equivalent to multiplying by its reciprocal. The video covers examples of dividing by fractions like 1/3, 2/3, and 3/4, emphasizing the importance of understanding numerators and denominators.

What is a unit fraction?

• A fraction with 1 in the numerator

• A fraction with a numerator greater than the denominator

• A fraction with 1 in the denominator

• A fraction with equal numerator and denominator

How do you divide a number by a unit fraction?

• Multiply the number by the fraction

• Subtract the fraction from the number

• Multiply the number by the reciprocal of the fraction

• Divide the number by the reciprocal of the fraction

What is the result of 6 divided by 1/3?

• 3

• 18

• 12

• 2

When dividing by a non-unit fraction, what is the equivalent operation?

• Divide by the reciprocal of the fraction

• Subtract the fraction from the number

• Multiply by the reciprocal of the fraction

• Multiply by the fraction

What is the reciprocal of 2/3?

• 3/2

• 3

• 2/3

• 1/2

How many groups of 2/3 are in 6?

• 12

• 18

• 9

• 6

What is the result of 6 divided by 3/4?

• 12

• 9

• 8

• 6

What is the reciprocal of 3/4?

• 3/4

• 4/3

• 3

• 1/3

What is the key concept when dividing by a fraction?

• Divide by the reciprocal of the fraction

• Multiply by the fraction

• Multiply by the reciprocal of the fraction

• Subtract the fraction from the number

What is the objective of the lesson on dividing by fractions?

• To add fractions

• To multiply fractions

• To divide a number by unit and non-unit fractions

• To subtract fractions