Multiplying Whole Numbers by Fractions Through Repeated Addition

Jeremy Berger from McDole Elementary explains how to multiply whole numbers by fractions using the repeated addition model. He uses the example of multiplying three by three-fourths, demonstrating how to separate fractions into parts, draw rectangles, and shade sections to represent the fractions. The process involves adding the shaded parts to find the total, resulting in nine-fourths. This method is suitable for fifth-grade math and can be further converted to a mixed number if needed.

What is the main topic of today's lesson?

• Subtracting fractions

• Multiplying whole numbers by fractions

• Adding whole numbers

• Dividing fractions

Tags

CCSS.4.NF.B.3D

CCSS.4.NF.B.3C

Which fraction is used in the example?

• 3 times 3/4

• 2 times 1/2

• 5 times 2/5

• 4 times 1/3

Tags

CCSS.5.NF.B.4A

How many rectangles are drawn to represent the fractions?

• Five

• Four

• Two

• Three

Tags

CCSS.3.NF.A.2A

CCSS.3.NF.A.1

Into how many parts is each rectangle divided?

• Two

• Three

• Four

• Five

Tags

CCSS.1.G.A.3

How many parts are shaded in each rectangle?

• One

• Four

• Two

• Three

Tags

CCSS.1.G.A.3

What is the denominator in the final answer?

• 5

• 4

• 3

• 2

Tags

CCSS.5.NF.A.2

CCSS.5.NF.A.1

How many total shaded parts are there in the final answer?

• Six

• Seven

• Eight

• Nine

Tags

CCSS.1.G.A.3

What is the final answer in terms of fractions?

• 6/4

• 7/4

• 8/4

• 9/4

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the repeated addition method used for?

• Dividing fractions

• Multiplying whole numbers by fractions

• Multiplying fractions

• Adding whole numbers

Tags

CCSS.7.NS.A.2B

CCSS.7.NS.A.2A

What can the final answer be converted to?

• A percentage

• A decimal

• A mixed number

• A whole number