Multiplying by Multiples of 10
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Objective
I can multiply multi-digit numbers by multiples of 10 using mental math and estimation strategies.
Part 1 of 4
Warm-up video
Khan Academy · 3:05Vetted 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
One way to solve 3 × 60 is to think of it as 60 + 60 + 60, which equals 180.
- 2
Since 60 is the same as 6 × 10, 3 × 60 can be solved as 3 × 6 × 10, which equals 18 × 10, or 180.
- 3
To solve 50 × 7, you can multiply 5 × 7 to get 35, then multiply by 10 (or add a zero) to get 350.
Part 3 of 4
Practice
11 questions
What is the value of 4 × 80? Solve this problem using mental math.
Explain two different methods you can use to calculate 70 × 6 mentally.
Part 4 of 4
Exit ticket
Quick comprehension check
“Calculate 80 × 9 using mental math strategies. Show your steps.”
Sample answer included in the free materials
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