2nd Grade Math

Measurements

Unit 2

What is a Measurement?

A measurement can be the size, length, mass, weight, or volume of an object. Why is measurement so important? How do we use measurement in our everyday lives?

We use measurement to......

  • Cook food using recipes

  • Find our height and weight at the doctor's office

  • Build towers and buildings

  • Create drawings

  • Measure liquids

Can you think of any other things we can use measurements for?

What Tools Can We Use to Measure an Objects Length?

Length is the measure of how long an object is. Height is the measure of how tall an object is.

Tool: Ruler

  • A ruler measure objects up to 12 inches

  • 12 inches = 1 foot

  • Therefore the length of a whole ruler is 1 foot

Tool: Yard Stick

  • A yard stick measures objects up to 36 inches

  • Since 12 inches = 1 foot, a yard stick can measure up to 3 feet

Tool: Tape Measure

  • Unlike rulers and yard sticks, tape measures are used to find the length of irregular shaped objects.

  • Tape measures are made out of flexible materials that allow it to be wrapped around objects.

Watch This Video to Learn More About Different Measurement Tools

Watch this Video to Learn how to Measure & Compare Lengths

There Are Two Sides of a Ruler: Inches & Centimeters

This ruler is measuring in inches. How do we find the length of this glue stick in inches?

  • Place one end of the object at the beginning of the ruler

  • Line the object up next to the ruler

This ruler is measuring in centimeters. How do we find the length of this glue stick in centimeters?

  • Place one end of the object at the beginning of the ruler

  • Line the object up next to the ruler

How long is the glue stick?

3 inches

How long is the pencil?

6 centimeters

Worksheet Time!

object-ruler-cm1.pdf

What Happens if an Object's Measurement is in between Numbers?

Objects will not always measure perfectly to a whole number. Sometimes objects can be in between two different numbers. Let's check it out!

Quarter Inches

  • On the inches side of the ruler, we will be focusing on quarter inches

  • What is a quarter inch? A quarter inch is when we split 1 inch into 4 smaller pieces.

  • Our 4 smaller pieces will be 1/4, 2/4 or 1/2, and 3/4, and 1

1/10 Centimeters

  • On the centimeter side of the ruler, there will be 10 small tick marks in between whole number

  • Each of these tick marks are worth 0.1 centimeters

Watch this Video to Learn More About Measuring to the Nearest Quarter Inch

Worksheet Time!

Click the link below then write down your answers! Scroll to the second page to check your answers!!

rulers-inches-2.pdf

Let's Play A Game

Play the game with both "customary" and "metric"!

Watch this Video to Learn how to Estimate Length

What Tools Can We Use to Measure Mass?

What is Mass?

  • Mass is the amount of matter (matter is any solid, liquid, or gas) in an object

  • Mass is the amount of "stuff" in an object

  • The more matter inside an object, the heavier it will feel

  • Mass can be measured in grams and kilograms

Triple Beam Balance

  • An instrument used to measure mass

How to Use a triple beam balance:

  1. Place one object on the pan of the balance

  2. You will see the pointer move down

  3. Move your 100 gram slider right until the pointer drops below the zero

  4. Move your 10 gram slider right until the pointer drops below the zero

  5. Move your 1 gram slider right until the pointer drops below zero

  6. Once the pointer is balanced, and pointing directly to zero, add up your total

  7. To add up your total, add up the number on your first, second and third beam.

  8. Your total represents the mass of the object in grams

Watch this video tutorial on how to use a triple beam balance.

Link: https://www.youtube.com/watch?v=BAf6HoVK6JI

Scale

  • Scales seen on your left are usually used in a science lab setting

  • An item is placed on the scale

  • The scale will show how much mass the object has in grams

What Tools can we use to Measure Liquids?

Measuring Cup

  • A measuring cup is most commonly used in a cooking setting

  • Liquids such as water are poured into the measuring cup

  • We can measure in cups, ounces, and pints

Graduated Cylinders

  • A graduated cylinder is most commonly used in a science lab

  • Liquids and chemicals were poured in the cylinder

  • Graduated cylinders measure the volume of liquids in a unit called milliliters

  • Millilitres is a measure of volume that is represented by (mL)

Beaker

  • A beaker is most commonly used in a science lab

  • Liquids and chemicals are poured in the beaker

  • Beakers measure the volume of liquids in unit called milliliters

  • Millilitres is a measure of volume that is represented by (mL)

Let's Practice Reading Graduated Cylinders

Directions:

  • Complete this interactive activity

  • Watch the Youtube Video "How to Read a Graduated Cylinder"

Interactive At

Youtube Link: https://www.youtube.com/watch?v=Xhig8eCpL48

What Tools can we Measure Temperature

Tool: Thermometer

  • A thermometer measures how hot or how cold an object is

  • Temperature is measured in either Fahrenheit or Celsius

Take a look at the picture. The thermometer reads 75 degrees Fahrenheit, but 24 degrees Celsius.

Watch these videos to learn how to read a thermometer and graduated cylinder!