Question

Farmer Brown feeds 12.1 kilograms of alfalfa to each of his 2 horses daily. How many kilograms of alfalfa will all his horses have eaten after 21 days? Draw an area model to solve

Answer 1

Answer: 508.2
12.1 times 2 is 24.2 
24.2 times 21 is 508.2

Answer 2

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