Slide 1 / 270 Slide 2 / 270 Second Grade Length 2015-12-8 www.njctl.org Slide 3 / 270 Slide 4 / 270 Table of Contents Page 1 Table of Contents Page 2 Click on the topic to Click on the topic to go to that section. go to that section. Introduction to Length Length Comparison Measuring with a Ruler Lab: Ring Toss Measuring in Different Units Measuring in Inches Estimating in and ft Measuring in Feet Estimating cm and m Measuring in Yards Lab: Packing Peanut Punt Measuring in Centimeters Number Line as a Ruler Lab: Centimeter Sam Number Stories on a Number Line Measuring in Meters Line Plots Using a Tape Measure Line Plots pt. 2 Which Unit? Which Tool? Slide 5 / 270 Slide 6 / 270 Standards for Mathematical Practices MP1 Make sense of problems and persevere in solving them. MP2 Reason abstractly and quantitatively. MP3 Construct viable arguments and critique the reasoning of others. Introduction to Length MP4 Model with mathematics. MP5 Use appropriate tools strategically. MP6 Attend to precision. MP7 Look for and make use of structure. MP8 Look for and express regularity in repeated reasoning. Click on each standard to bring Click to return to you to an example of how to meet Table of Contents this standard within the unit.
Slide 7 / 270 Slide 8 / 270 What is Length? Length is the distance from one end of an object to the other end. The average lion is 8 1/2 feet long. Slide 9 / 270 Slide 10 / 270 Measuring Length How Big is a Foot? There can be problems when measuring with How wide is the classroom using student feet? objects that are not always the same size. Click the book to hear a reading of How Big is a Foot?, by Rolf Myller. After the story, discuss why the bed made by the carpenter did not turn out how the king expected. Slide 11 / 270 Slide 12 / 270 Standard Measuring Tools The problem in the story is that the king's foot was not the same size as the apprentice's foot! These tools are in standard units and they are what we use to measure length when we want to have a common We can measure with our bodies, or parts of our understanding of the size of something. bodies like the carpenter and the king did with their Yard Stick feet. However, it doesn't always work because people are different sizes. Measuring Tape Ruler Meter Stick To be accurate, we need to use a standard measuring tool that is always the same size and shape. This is called "standard measurement".
Slide 13 / 270 Slide 14 / 270 What is a Standard Unit? Can you see the units on the ruler and measuring tape? They are marked with hash marks and numbers. Each unit is the exact same length. The units are numbered. Ruler inch units centimeter units Measuring Tape Slide 15 / 270 Slide 16 / 270 1 If you measured a length of rope with your feet, and Standard Measurements then your friend measured the same length of rope with their feet, will you both get the same length? There is United States Standard Measurement and Metric Standard Measurement. We will learn about both types of measurement A Yes B No US Standard Measurement: Metric Standard Measurement: C Maybe - Inches - Centimeters - Feet - Meters - Yard Slide 17 / 270 Slide 18 / 270 2 Pick the two units of measurement that are part of the US 3 A hand is a standard measuring tool. Measuring System True A feet False B meter C inches
Slide 19 / 270 Slide 20 / 270 4 Is a meter part of the US measuring system? 5 A tape measure is pictured below. Yes True No False Slide 21 / 270 Slide 22 / 270 Slide 23 / 270 Slide 24 / 270 Ruler A ruler is a measuring stick used to measure the length of an object or the distance from one point to another. Measuring with a Ruler A standard ruler has 12 evenly spaced segments called "inches". Click to return to Table of Contents
Slide 25 / 270 Slide 26 / 270 Ruler Ruler When using a ruler, we start at the left and read the numbers From the 0 to the 1 is one inch or 1 centimeter. to the right. A ruler starts at 0. Sometimes, the 0 is not printed on the ruler because it is too close to the end but it still starts with 0. Start with End with From the 1 to the 2 is one inch or centimeter. 0 12 From the 0 to the 2 is two inches or centimeters. Sometimes, the last number on the ruler is missing as well. How would you know which number is missing? Slide 27 / 270 Slide 28 / 270 Ruler Ruler When using a ruler to measure the length of an object, Most rulers have markings on the top and the bottom. place the end of the object along the ruler on the 0 mark. If you look closely, you should see "in" on one side. Put your finger on the other end of the object and see This stands for inches. which number on the ruler is it closest to. The other side should have "cm". This stands for centimeters. Which unit is longer? This pencil is 4 inches long. How many centimeters is it? Slide 29 / 270 Slide 30 / 270 Ruler Ruler Move the paperclip to measure how long it is. Sometimes we need to use a ruler up and down. Move the boot to measure how tall it is.
Slide 31 / 270 Slide 32 / 270 Ruler Ruler How long is the book? Move the dog to measure how long it is. Slide 33 / 270 Slide 34 / 270 6 The ruler is correctly placed to measure the basket. Lab: Classroom Measuring True False Click to return to Table of Contents Slide 35 / 270 Slide 36 / 270 7 What number is missing from the ruler? 8 A standard student ruler can measure in ______ and ______. A yards B inches C centimeters
Slide 37 / 270 Slide 38 / 270 9 When we measure with a ruler, we start measuring at 1. 10 A standard student ruler ends with ______. True A 0 False B 12 C 11 D 1 Slide 39 / 270 Slide 40 / 270 Slide 41 / 270 Slide 42 / 270 Measuring in Inches An inch is a small standard unit of measurement. The abbreviation for inch is "in". Measuring in Inches An average thumb is 1 inch from the tip to the knuckle. Can you think of any objects about 1 inch? Click to return to Table of Contents
Slide 43 / 270 Slide 44 / 270 One Inch Tall Steps when measuring in inches with a ruler If you were only one inch tall, you'd ride a worm to school. The teardrop of a crying ant would be your swimming pool. A crumb of cake would be a feast 1. Make sure the ruler has inches on the top And last you seven days at least, A flea would be a frightening beast If you were one inch tall. If you were only one inch tall, you'd walk beneath the door, And it would take about a month to get down to the store. A bit of fluff would be your bed, You'd swing upon a spider's thread, And wear a thimble on your head If you were one inch tall. You'd surf across the kitchen sink upon a stick of gum. You couldn't hug your mama, you'd just have to hug her thumb. You'd run from people's feet in fright, To move a pen would take all night, (This poem took fourteen years to write-- 'Cause I'm just one inch tall). By: Shel Silverstein Slide 45 / 270 Slide 46 / 270 Steps when measuring in inches with a ruler Steps when measuring in inches with a ruler 1. Make sure the ruler has inches on the top 1. Make sure the ruler has inches on the top 2. Place the object above the ruler 2. Place the object above the ruler 3. Line up the end of the object to the 0 mark on the ruler Slide 47 / 270 Slide 48 / 270 Steps when measuring in inches with a ruler Steps when measuring in inches with a ruler 1. Make sure the ruler has inches on the top 1. Make sure the ruler has inches on the top 2. Place the object above the ruler 2. Place the object above the ruler 3. Line up the end of the object to the 0 mark on the 3. Line up the end of the object to the 0 mark on ruler the ruler 4. Place your finger at the other end of the object 4. Place your finger at the other end of the object and see which number it is closest to on the ruler and see which number it is close to on the ruler 5. Label your measurement 4 inches
Slide 49 / 270 Slide 50 / 270 Practice Practice How long is the bike? How long is the frame? Slide 51 / 270 Slide 52 / 270 Practice Practice How long is the crayon? How long is the football? Slide 53 / 270 Slide 54 / 270 Practice Work with a partner, use your rulers to see if you can find items in the classroom that are about: Billy said the car is 9 inches long. Is he correct? 2 inches 4 inches 8 inches 10 inches What did we find? 4 in 2 in 8 in 10 in
Slide 55 / 270 Slide 56 / 270 What were our measurements? Work with a partner to measure the lengths of the following items in inches: 3. Student Computer 1. Workbook: _____ in 1. Workbook 2. Desk: _____ in 2. Desk 4. Bookshelf 3. Student Computer _____ in 4. Book Shelf _____ in Should we all have the same or different measurements? Slide 57 / 270 Slide 58 / 270 11 How many inches is this pencil? 12 About how many inches is this crayon? Slide 59 / 270 Slide 60 / 270 14 Aisha measured this line to be 3 inches. Is she correct? Yes No
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