Multiplication as Scaling
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Objective
I can explain how multiplying a number by a fraction or a whole number changes its size.
Part 1 of 4
Warm-up video
Khan Academy · 5:06Vetted channel
We don't generate video — this one is by Khan Academy on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
The expression 5 × 2/(3 × 5) can be simplified to 1 × 2/3, which equals 2/3.
- 2
Multiplying 2/3 by 7/8, a number less than 1, scales the value of 2/3 down.
- 3
Multiplying 2/3 by 8/7, a number greater than 1, scales the value of 2/3 up.
Part 3 of 4
Practice
10 questions
Explain in your own words how multiplying a number by a fraction between 0 and 1 affects the size of the original number.
How does multiplying a number by a fraction greater than 1 affect the size of the original number?
Part 4 of 4
Exit ticket
Quick comprehension check
“Without calculating, order these expressions from least to greatest: 4/5 × 3/4, 6/6 × 3/4, 8/7 × 3/4. Explain your reasoning.”
Sample answer included in the free materials
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