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7.05 Story problems with measurement

Lesson

Are you ready?

Do you remember how to convert units of length? Let's try this problem to practice.

Convert $7$7 meters to centimeters.

  1. $7$7 m = $\editable{}$ cm

 

Learn

Let's review how to find keywords in story problems so we know which operation we need to do.

question 1

Buzz buys a $4000$4000 g box of washing powder.

  1. If he uses $2$2 kg of the washing powder, how many grams of powder is left in the box?

Learn

Let's see if we can find some clues for multiplication and division in this video.

Question 2

A whale is $8$8 yards long.

  1. What is the length of the whale in feet?

  2. The whale is traveling in a pod of $20$20 whales. Use the length of the whale to estimate the length of the whole pod in feet.

Learn

If we want to add, subtract, multiply, or divide measurements, we need to first make sure that all the measurements are in the same units. To do this, we can use the different relationships:

Distance
$1$1 kilometer $=$= $1000$1000 meters
$1$1 meter $=$= $100$100 centimeters
$1$1 yard $=$= $3$3 feet
$1$1 foot $=$= $12$12 inches
 
Mass
$1$1 kilogram $=$= $1000$1000 grams
$1$1 pound $=$= $16$16 ounces
     
Volume
$1$1 liter $=$= $1000$1000 milliliters
 
Time
$1$1 hour $=$= $60$60 minutes
$1$1 minute $=$= $60$60 seconds

 

Apply

Question 3

Find the value of 

$8$8 hours $-$ $40$40 minutes

  1. $\editable{}$ hours $\editable{}$ minutes

 

Remember!

When we have a story problem, we need to think about the story, and use the keywords to work out which operators to use. Some words that we may find in a story could be:

addition subtraction multiplication division
more less groups of equally share
add take away product each
give take times equal groups
arrive leave total per

 

Outcomes

4.MD.2

Use the four operations to solve word problems involving distances, intervals of time, liquid volumes, masses of objects, and money.

4.MD.2.a

Include problems involving simple fractions or decimals, and problems that require expressing measurements given in a larger unit in terms of a smaller unit..

4.MD.2.b

Represent measurement quantities using diagrams such as number line diagrams that feature a measurement scale.

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