Multiplying with Arrays
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Objective
I can solve multiplication problems with 2-digit numbers using arrays.
Part 1 of 4
Warm-up video
Khan Academy · 4:26Vetted 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
When multiplying 37 × 26, we can break it down into (30 × 6) + (7 × 6) + (30 × 20) + (7 × 20), which equals 180 + 42 + 600 + 140.
- 2
Multiplying 37 × 26 can be thought of as finding the sum of 37 sixes and 37 twenties.
- 3
When multiplying two 2-digit numbers using partial products, it's helpful to stack the numbers by their place value to keep track of the ones, tens, and hundreds.
Part 3 of 4
Practice
3 questions
Break down 24 x 15 into smaller multiplication problems based on place value. What two multiplications involving multiples of 10 will you need to solve?
Solve 15 x 12 using the method from the video. Show each step, breaking the numbers into tens and ones and multiplying each part separately.
Part 4 of 4
Exit ticket
Quick comprehension check
“Solve 14 x 12 using the array method. Break down each number by tens and ones, and show all the smaller multiplication problems you need to solve.”
Sample answer included in the free materials
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