Introduction to Measurement Developing Customary and Metric Measuring Skills

Why Learn to Measure? Valuable skill for a job Valuable skill for hobbies Valuable skill for every day life

Measurement Systems Two types of measurement systems exist. –English (Customary / Standard) - Metric (SI or International System)

Be an active learner This presentation is meant to teach you…. The next step is for you to do these things on your own in a packet – will you be ready? READY! Aww… I wasn’t paying attention!

English vs: Metric Rulers English = inch labeled as 1 in. or 1“ Metric = centimeter or millimeters labeled as 1 cm or 10 mm

English (Customary) System InchesFractions ¼ ¾ The Whole Inch First Half Second Half 1 / 8 3 / 8 5 / 8 7 / 8 1 / 16 3 / 16 5 / 16 7 / 16 9 / / / / 16

1. Find out how many parts the inches are divided into. Count the spaces in 1 inch. This number will be the denominator. 2. Count the number of whole inches. Write down the number. 3. Count the number of spaces after the last whole inch. This number will be the numerator. 4. Reduce fraction, if possible & label the units Steps in Using the English (Customary) System

Step 1 Step 2 Step 3 Find Denominator Count Whole Inches Find Numerator Step 4Reduce Fraction, If Necessary Let’s Review

Let’s Practice What is the distance from the end of the ruler to A? What is the distance from the end of the ruler to E? What is the distance from the end of the ruler to D? What is the distance from the end of the ruler to C? What is the distance from the end of the ruler to B? ¼ in. 15/16 in. 1 ¾ in. 2 3/8 in. 3 1/16 in.

Metric System International System of Units (SI) Millimeters and Centimeters Decimals 1 mm = 0.1 cm 5 mm = 0.5 cm 10 mm = 1 cm

Steps in Using the Metric (SI) System 1.Count the number of whole centimeters (cm). These are the larger lines with numbers 2. Count the number of lines after the whole number. The smaller lines are millimeters (mm). 3. Put in correct terms. Since mm are 1/10th of a cm, if you measure 7 marks after 1 cm, the measure is 1.7 cm or 17 mm long.

Let’s Practice What is the distance from the end of the ruler to A? What is the distance from the end of the ruler to E? What is the distance from the end of the ruler to D? What is the distance from the end of the ruler to C? What is the distance from the end of the ruler to B? 4 mm = 0.4 cm 19 mm = 1.9 cm 37 mm = 3.7 cm 63 mm = 6.3 cm 73 mm = 7.3 cm

Converting from English to Metric Convert from: To:Multiply by: milekilometer (km) inchmillimeter (mm)25.4 inchcentimeter (cm)2.54 footmeter (m) yardmeter (m)0.9144

Converting from Metric to English Convert from:To:Multiply by: kilometer (km)mile millimeter (mm) inch centimeter (cm) inch meter (m)foot3.281 meter (m)yard1.094

Practice Converting Let’s convert 1 ¼ inches to centimeters Looking at our chart, I know to convert inches to centimeters, I need to multiple the inches by 2.54cm 1 ¼ x 2.54cm = ? Cm –1 st we need to carry-out the division for the fraction ¼ –So, 1 divided by 4 = ?

Continued 1 ¼ becomes the decimal x 2.54cm = 3.175cm

Image Resources Microsoft, Inc. (2008). Clip Art. Retrieved October 7, 2008, from