Keywords for Multiplication 04:41 minutes

Video Transcript

Transcript Keywords for Multiplication

We’re here at the Sandstone Aquifer for the Strength Factor Contest. Let’s meet the contestants.

We have animals from far and wide competing in feats of strength: a gorilla vs a vulture competing in the deadlift an elephant vs a tiger in a carrying contest and an ox vs a dung beetle in a contest of pushing power. To judge the winners, the judge will compare how much weight each of the contestants can lift with their respective body weight. The contestants with the greatest strength factor in their competition will be crowned the victor. Our judge, David Hasselsloth, will have to perform multiple calculations to determine the relative strength of the two competing animals. Since this is a contest of relative strength, the judges need to know the keywords for multiplication.

In multiplication problems, you’re given a multiplicator and a multiplicand. When we multiply these together, we get the product, which is the answer. Thanks to the commutative property of multiplication, it doesn’t matter the order in which things are multiplied together so the multiplicator and multiplicand are commonly referred to as factors. There are many ways to represent multiplication: vertically, like this or horizontally like this: Each of these methods of representation mean the same thing, so which one you use is your choice.

David looks at the results from the deadlift competition. Kong weighs 350 lbs. and registered a strength factor of 10! <so if you multiply those together, that means he lifted 3500 lbs! To match or beat Kong's result, Griff has to register a strength factor of 10 or higher. Unfortunately, Griff only managed to lift 4 times, or quadruple, his body weight. Griff weighs in at 25 lbs., and registering a strength factor of 4 means he lifted 100 lbs. David Hasselsloth determines Kong to be the deadlift champion.

In the closest competition of the day, Elly and Tiggy squared off in the static carry competition. Elly was able to carry 1.5 lbs for every 1 lb. of body weight. Since she weighs 13,000 lbs., Elly was able to carry 19,500 lbs!!! That’s gonna be tough to beat! Tiggy, however was up to the challenge and was able to carry double her bodyweight! David Hasselsloth checks the records and sees that Tiggy weighed in at 370 lbs. Judge Hasselsloth multiplies Tiggy’s weight by two and comes up with 740. The honorable Judge judges Tiggy’s try to be greater than Elly’s and declares Tiggy the winner of this event. Because Tiggy's multiplicand is two compared to Elly's multiplicand of 1.5.

Beetle Dungee elects to go first in the push-power competition. Going. Still going. Whoa…PER ounce of body weight…Beetle Dungee pushed over 1,100 ounces!!! He’s clearly the winner! A weight of only 0.97 oz. and the GREATEST strength factor of the competition - 1,141 times his bodyweight!!! Oxy’s so dejected that he doesn’t even ATTEMPT a pull!

Before we see the awards ceremony, let's review some keywords we used for multiplication: The multiplicator and multiplicand equal the product. Smaller pieces of the products are called factors and some trigger words that tell you to use the multiplication operation are: times, quadruple, for every, double, and per. So when we see or hear these words, we know we need to multiply. It's all over! Beetle Dungee is declared the winner of the Strength Factor contest! And he humbly receives his crowned and holds his ball of dung up in victorious triumph. Oops…I guess he's a little ticklish!

Keywords for Multiplication Übung

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  • Find the right ways to express multiplication.

    Tipps

    The keyword factor indicates multiplication.

    There exist different ways of writing down a product.

    Regardless of how a product is written down, the result is always the same. The result of multiplication is the product.

    Lösung

    First of all we need to decide which operation we have to use.

    The body weight of Kong is $350$ lbs. A strength factor of $10$ is given too.

    The keyword factor indicates, that we have to multiply.

    Here you see different ways to write a multiplication down. Regardless of how it is written down, the result, a product, is always the same:

    • $350 \times 10 =3500$
    • $350(10)=3500$
    • $3500\cdot 10=3500$
  • Determine the keywords for multiplication.

    Tipps

    Remember for addition: summand plus summand equal sum.

    Imagine a word problem with the corresponding keyword.

    Let's have a look at the following example: the amount of $20$ dollars Paul saved is tripled by his aunt Sally.

    The corresponding expression is given by $3\times 20$.

    Keep the following for subtraction in mind: minuend minus subtrahend equal difference.

    Lösung

    Here you see some keywords indicating multiplication:

    • times
    • quadruple
    • for every
    • double
    • per
    We say that

    multiplicator $\times$ multiplicand $=$ product

    or

    factor $\times$ factor $=$ product.

    All these terms are keywords for multiplication too.

  • Find the keywords indicating multiplication.

    Tipps

    Here you see some keywords for multiplication:

    • product
    • as many as
    • doubled ($\times 2$)
    • tripled ($\times 3$)

    Here you see different ways to write down multiplication.

    Read $\times$ as times.

    Lösung

    Griff registers a strength factor of $4$.

    We can also say times $4$ or quadruple.

    All of those keyword indicate multiplication.

    This leads to $25\times 4=10$.

  • Determine the strength factor.

    Tipps

    Each strength factor is a decimal number less than $1$.

    If you know the strength factor you have to multiply by, then multiply it by the body weight to get the amount of ice cream eaten.

    Turn the equation,

    strength factor $\times$ weight $=$ amount of ice cream,

    into a division.

    Let's have a look at the following example: we know the carry weight of the elephant, i.e. $30000$ lbs, and his body weight of $15000$ lbs. We get the strength factor as follows:

    $f=\frac{30000}{15000}=2$.

    Lösung

    Here we know the body weight for each person as well as Billy the cat. We also know the amount of ice cream each family member eats.

    How can we determine the strength factor for each person as well as for Billy?

    We divide the amount of ice cream by the bodyweight.

    Father

    $f=\frac{1.26}{180}=0.007$

    Mother

    $f=\frac{0.56}{140}=0.004$

    Paul

    $f=\frac{0.56}{70}=0.008$

    Billy

    $f=\frac{0.75}{15}=0.05$

  • Find the right expression.

    Tipps

    Decide the keywords and the operation they indicate.

    Here you get some keywords for multiplication

    • times
    • product
    • as many as
    • double ($\times 2$)
    • triple ($\times 3$)

    Decide what to multiply.

    Let's have a look at an example: Paul is buying $5$ muffins, at $2$ dollars per muffin.

    So he has to pay $5\times 2=10$ dollars in total.

    Lösung

    The elephant is able to carry $2.5$ lbs. for each $1$ lb. of its own body weight.

    He weights $12000$ lbs. So we can find the carry weight as follows:

    $12000\times 2.5=30000$ lbs.

    His friend the tiger has a strength factor of $3$, a triple, and a body of weight of $400$ lbs.

    Again we have to multiply the values, $400\times 3=1200$, to get the carry weight of $1200$ lbs.

  • Identify the correct expression.

    Tipps

    You need two pieces of cake for each of your friends.

    How many pieces of cake do you need for $4$ friends?

    Right: You have to multiply $4\times 2=8$ to get the number of needed pieces of cake.

    $7$ days are one week.

    Cooking or baking are good examples for multiplying:

    If you know the recipe for $10$ muffins you have to multiply the amounts of ingredients accordingly.

    • For $25$ muffins you have to multiply by $2.5$.
    • For $40$ muffins you have to multiply by $4$.
    Lösung

    • Sally's buying of chairs
    The keyword is each: so she must multiply $12\times 15=180$. She has to pay $180$ dollars in total.

    $~$

    • Biking Paul
    The measure miles per hour includes the keyword per for multiplication. So we conclude the resulting miles as follows:

    $13 \frac{\text{miles}}{\text{hour}}\times 10 \text{ hours}= 130$ miles. Here you can shorten the fraction by hour.

    $~$

    • Swimming Matteo
    Every week indicates multiplication. Let's do the math: $7\times 20=140$. That's the desired number of laps.

    $~$

    • Apple pie
    $11$ apples per pie and $7$ pies lead to $11\cdot 7=77$ apples in total for $7$ pies.