hey it's Kaeleigh in this lesson we're going to talk about the units we use to
measure mass in the United States most of us have used or heard the word pound
before pounds are a unit used to measure weight for example my dog weighs 55
pounds pounds is often abbreviated to lb for short but how much is just one pound
a soccer ball is about one pound and a loaf of sandwich bread is about one
pound now what makes up a pound we have another unit for weight called ounces an
ounce is lighter than a pound in fact there are 16 ounces in one pound for
example when my dog was born he weighed 10 ounces we can use the abbreviation
oz for ounces so how much is an ounce well a standard length pencil is about
one ounce and one double-a battery is about one ounce so if one pencil is
equal to one ounce then 16 pencils would be equal to one pound
remember we know this because 16 ounces is equal to one pound so if this soccer
ball weighs one pound how many ounces is it that's right it's 16 ounces because
one pound is equal to 16 ounces let's try a trick your example a soccer coach
carries a bag of five soccer balls if each ball weighs one pound how much
does the bag weigh in ounces so if we have five balls let's draw them
out there there's one two three four five and we know that they each weigh
one pound so we can label them there and now what do we know about pounds we know
that one pound is equal to yep sixteen ounces that means each of these
balls weighs 16 ounces since they all weigh one pound so if we want to know
how much each of these balls weighs together we would need to add 16 ounces
together five times now if you know how to multiply with big double-digit
numbers you'll know that adding 16 five times it's the same as saying 16 ounces
times five and either way we get the answer of 80 ounces so the five soccer
balls together will equal 80 ounces and now if we knew that the weight of the
bag was equal to let's say five ounces then we would add five ounces the weight
of the bag plus the five soccer balls which is 80 ounces and that would give
us a total for the bag plus the five soccer balls of 85 ounces so that would
be our total now you know the US customary units for weight the ounce and
the pound pack is what you've learned by doing the online games and quizzes have
fun and remember to always be clever