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Compact Method
Keenya said she could use the compact method to solve the airport lights problem.
She explained how she solved 4 324 this way.
“I began by multiplying 4 4 = 16. I know that 16 is 1 ten and 6 ones.”
The 1 Keenya wrote above the problem as a reminder is sometimes called a carry. Keenya then multiplied 4 2 tens = 8 tens, and she then added the extra ten to get 9 tens or 90.
Then Keenya multiplied 4 3 hundreds = 12 hundreds or 1200.
She said, “I know that 1200 is 1 thousand and 2 hundreds.”
- How is Keenya's compact method similar to Roberto's all-partials method? What is the same and what is different?
- How is Keenya's compact method similar to John's method using expanded form? What is the same and what is different?