All the horses will have eaten 508.2 kg alfalfa after 21 days
Further explanation
Given
Each horse eats 12.1 kg/day
Farmer Brown has 2 horses
In a day Farmer Brown needs:
\(\boxed{12.1\times 2 = 24.2 kg/day\ }\)
In 21 days Farmer Brown will need:
\(\boxed{24.2\times 21\ }\)
to solve this equation we can use partial product or standard algorithm
Partial product
24.2 x 21
= (20+4.2)(20+1)
= (20x20) + (20x4.2) + (20x1) + (4.2x1)
= 400 + 84 + 20 + 4.2
\(\boxed{= 508.2\ }\)
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Keywords: multiplication, partial factors, standard algorithm, how many alfalfa the farmer needs, problem math, problem multiplication
