# MATH SECOND GRADE MEASUREMENT 2. Look at the ruler. We can use a ruler to help us add and subtract. A ruler is just like a number line. We can jump using.

## Presentation on theme: "MATH SECOND GRADE MEASUREMENT 2. Look at the ruler. We can use a ruler to help us add and subtract. A ruler is just like a number line. We can jump using."— Presentation transcript:

Look at the ruler. We can use a ruler to help us add and subtract. A ruler is just like a number line. We can jump using standard ( inches, feet, yards ) or metric ( centimeters, meters ). We can jump up to add. We can jump back to subtract. I can jump up to add. I can jump back to subtract.

This little bunny is adding numbers by jumping on the number line. 3 + 3 + 2 = First, he added 3. Then he added 3 more. Then he added 2. What number did the little bunny stop on? ? = _____ 3 +3 +2 ?

You can skip count or count by using a number line.

You can add or subtract by using standard or metric rulers. 1 + = 4 15 - 5 - = 7

Little frog knows how to use a number line to add. 0 + 2 + 2 + 2 + 2 + 2 = ____ Little frog can start at ____ jump 10 and end up at 15 using a number line. ____ + 10 = 15

Little frog is jumping up to add. Can you write the number sentence for little frog? ____ + ____ = ____ Little frog wants to jump the same number sentence on a ruler. Can you draw his jumps for him?

Write the number sentence that goes with each number line.

This little bunny wants to subtract by hopping down the metric ruler. Draw the hops the bunny will make for this equation: 20 - 4 = ____

Look at the number lines. Can you make the same number sentences on a metric ruler? Show your jumps!

Use the metric ruler to help you solve each equation. Liam holds the record for long jumps at his school. He can jump 6 feet from a standing position. Liam wants to increase his jump to 7 feet. How much farther does Liam need to jump? 6 + ? = 7 ___ + ___ = ___ Charlotte is cutting flowers for her mom. Each stem is 10 inches long. Charlotte wants the stems to be 8 inches long. How much should she cut off? 10 - ? = 8 ____ - ____ = ____

Use the standard ruler to help you solve each equation. Noah had a rope that measured 11 yards in length. Noah cut some of the rope. Now the rope is 7 yards in length. How much did Noah cut off? _____ - _____ = _____ Amelia has a 9 inch ribbon for her hair. She cut the ribbon to make it 5 inches long. How much ribbon did Amelia cut off? _____ - _____ = _____

Use the metric ruler to help you solve each equation. Aria had a candy bar that was 8 inches long. She took a big bite. Now her candy bar is only 5 inches long. How big was her bite? _____ - _____ = _____ Oliver needed a long piece of paper. He took a 16 inch piece of paper and taped another 7 inch piece of paper to it. How long is his paper now? _____ + _____ = _____

Use the standard ruler to help you solve each equation. Ethan wants to draw a 9 foot line on his driveway. First he draws a 6 foot line. How long should the next line be to reach 9 feet? _____ _____ = _____ Olivia wants her hair to be 11 inches long. Her mom measured her hair and found that her hair needs to grow 5 more inches. How long is Olivia’s hair now? _____ _____ = _____

Use the metric ruler to help you solve each equation. Violet is reading a chapter book. She has already read 13 chapters but wants to finish the book before the weekend. There are 19 chapters in the book. How many chapters does she still need to read? _____ _____ = _____ Asher’s race car sped across the finish line in only 24 seconds. He wants his car to cross the finish line in 21 seconds. How much faster does his car have to be to accomplish this? _____ _____ = _____

Use the metric ruler to help you solve each equation. Ava threw the ball 25 meters. Sophia threw the ball 3 meters farther than Ava. How far did Sophia throw the ball? _____ _____ = _____ Benjamin swims 13 laps each day. He wants to be able to swim 20 laps daily by the end of summer. How many more laps does he need to swim to reach his goal? _____ _____ = _____

Use the metric ruler to help you solve each equation. Nalia’s puppy is only 9 inches tall. Her mother says that the puppy will grow to be 26 inches tall. How much taller will her dog be when he is grown? _____ _____ = _____ Henry wants to learn 30 news words each month. He has already learned 17 words. How many more does he need to learn to reach his goal? _____ _____ = _____

Use a portion of a meter stick to help you solve each equation. Owen has 82 cars in his collection. His goal is to have 95 cars by his birthday. How many more cars does Owen need to reach his goal? _____ _____ = _____ Emma has saved 75 cents. She needs to save 18 more cents to buy a granola bar. How much does the granola bar cost? _____ _____ = _____

Use a portion of a meter stick to help you solve each equation. Scarlett can’t wait to show off her sticker collection. She had 87 stickers but some got lost. Now she only has 72 stickers. How many got lost? _____ _____ = _____ Caleb wants a new bike that costs 94 dollars. He has already saved 77 dollars. How much more does he need to save? _____ _____ = _____

Use the meter stick to help you solve each equation. Jackson had 98 fish in his aquarium. He gave some away. Now he has 89 fish. How many fish did he give away? _____ _____ = _____ Seventy-four second grade students are going on a field trip. Twelve parents and seven teachers are going with them. How many are going on the field trip? ____ ____ ____ = _____

Create your own number line to solve each equation. Grayson has 18 Lego sets. He has asked for 3 more sets for his birthday. If Grayson gets his wish, how many Lego sets will he have? _____ _____ = _____ Xavier spent 49 dollars on a skateboard and a new helmet. The helmet costs 14 dollars. How much did the skateboard cost? _____ _____ = _____ Write in the numbers below. Show your jumps!

Create your own number line to solve each equation. Nora and Noah are twins. Noah is 52 inches tall but Nora is only 47 inches tall. How much shorter is Nora than her brother Noah? _____ _____ = _____ Audrey and Vivienne are serious about recycling. They have collected 72 plastic bottles to recycle. They want to collect 100 bottles. How many more do they need to collect to reach their goal? _____ _____ = _____ Write in the numbers below. Show your jumps!

Create your own number line to solve each equation. Aurora is measuring material to make a dress. She needs 62 inches of fabric. The fabric is 100 inches long. How much extra material will Aurora have left over? _____ _____ = _____ Declan jumped his bike 84 inches. His friend Levi jumped 91 inches. How much farther did Levi jump than Declan? _____ _____ = _____ Write in the numbers below. Show your jumps!

Create your own number line to solve each equation. Landon is drawing a hopscotch on the sidewalk. He draws the first square with 22 inch sides. He wants the next square to be 6 inches bigger. How big should he draw the next square? _____ _____ = _____ Alexander cut a 59 inch piece of bamboo to make a cane pole. His dad’s cane pole needs to be 23 inches longer. How big should Alexander cut the next piece of bamboo? _____ _____ = _____ Write in the numbers below. Show your jumps!

Create your own number line to solve each equation. Aidan has joined the golf team. His golf club is 73 centimeters long. His brother is taller and needs a golf club that is 18 centimeters longer. How long should his brother’s golf club be? _____ _____ = _____ Lilly’s bedroom door is 36 inches wide and 60 inches tall. How much taller is the door than it is wide? _____ _____ = _____ Write in the numbers below. Show your jumps!

Create your own number line to solve each equation. Fynn catches a fish that is 37 centimeters larger than Elijah’s fish. Elijah’s fish was 68 centimeters long. How long was Fynn’s fish? _____ _____ = _____ Abigail needs a baseball bat for practice. Her brother’s bat is 90 centimeters long. Her bat should be 25 centimeters shorter. What should be the measurement of her bat? _____ _____ = _____ Write in the numbers below. Show your jumps!

Many times you will not have a ruler or a number line to help. You can draw your own equally spaced lines to create a number line to help you add or subtract. You can use the lines on your notebook paper. The lines are evenly spaced. You can use graph paper boxes.

Set up your number line to help solve the equation. Gavin’s TV screen is 48 inches. Ella’s screen is 9 inches larger. How wide is Ella’s TV screen? _____ _____ = _____

Chloe and Adalyn got a new 18 foot pontoon boat. Lucas and his family got a 27 foot camper. How much smaller is the boat than the camper? ____ ____ = ____

Gabriel wants to hang a rope swing from the big tree in his front yard. He needs 17feet of rope. He finds 32feet of rope in his garage. How much should he cut off? _____ _____ = _____

Elizabeth and Alice are planning a party. They want to have games and races. They measure off a sack race course of 22 feet. They try out the course and Alice falls down at 17 feet. How much farther did she need to run to complete the race? ____ ____ = ____

Grace is going on a mini road trip with her parents. They travel 45 miles Friday night. They need to travel another 53 miles on Saturday. How long is their trip? ____ ____ = ____

Elliott and Emmett have 100 homes on their paper route. Elliott throws 61 papers each morning. Emmett throws the rest. How many papers does Emmett throw each morning? ____ ____ = ____

Harper is building a fence. She needs 80 meters of wire to complete her fence. She only finds 63 meters of wire in the barn. How much more wire will she need to buy? ____ ____ = ____

Thinking about math is fun. When you use a number line or a ruler to help you you can talk about the math as you add and subtract. I had 12 stickers but I lost 3. How many do I have now? I drew a number line on my paper. I started at 12. I moved back 3 because I lost some stickers. I have 9 stickers left. 12 - 3 = ? 2 4 6 8 10 12

Can you talk about the math? Give it a try. My equation is 51 - 14 = ? My equation is 18 + 11 = ? My equation is 75 - ? = 52

Can you talk about the math? My equation is 68 - 56 = ? My equation is 100 - 89 = ? My equation is 21 - ? = 19

Can you talk about the math? My equation is 93 - 71 = ? My equation is 56 + 38 = ? My equation is ? - 7 = 74

Another tool you can use to help you talk about the math is a hundreds chart or hundreds board. In the morning there were 15 students waiting in the cafeteria. 11 more students came in for breakfast. The bell rang and some students went to class. Now there are 13 students in the cafeteria. How many students went to class? 15 + 11 - _____ = 13

In the morning there were 15 students waiting in the cafeteria. 11 more students came in for breakfast. The bell rang and some students went to class. Now there are 13 students in the cafeteria. How many students went to class? 15 + 11 - _____ = 13 TALK ABOUT THE MATH! I used a hundreds board. I started at 15 and moved down one row which is 10 more, then I moved 1 to the right and landed on 26.This shows the 11 that came in. Starting at 26 I need to move back to 13 because that is how many students are left. I move up one row to 16 and then 3 to the left. I moved back a total of 13 spaces. That means that 13 students left the cafeteria.

Now you try some. The School Store was open. 17 students were buying pencils, 22 students were buying paper and some students wanted erasers. There were 43 students at the school store. How many wanted to buy an eraser? TALK ABOUT THE MATH! ____________________________________________ ____________________________________________ ____________________________________________ ____________________________________________ WRITE THE EQUATION HERE

The second grade is going on a field trip. Ms. Brinkerhoff and Ms. Clements have 27 students. Mrs. Grant and Ms. Horne have 31 students and Ms. Staggers and Ms. Troutman have some students. A total of 79 students are going on the field trip. How many students are in Ms. Staggers and Ms. Troutman’s rooms? TALK ABOUT THE MATH! ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ WRITE THE EQUATION HERE

It is wheeled vehicle day at school. 32 students rode their bikes, some students rode skateboards, and 17 students had roller blades. A total of 73 students attended wheeled vehicle day. How many students had skateboards? TALK ABOUT THE MATH! ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ WRITE THE EQUATION HERE

The school wanted to sell doughnuts to earn money for field trips. They ordered some doughnuts with sprinkles and 24 plain doughnuts. They sold 49 doughnuts all together and have 11 doughnuts left over. How many doughnuts with sprinkles did they have? TALK ABOUT THE MATH! ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ WRITE THE EQUATION HERE

William invited the entire class to his party. He also invited 18 friends from his neighborhood. His mother baked 40 cupcakes and got lots of ice cream and treats. William was sad because 11 kids could not come to his party. How many kids are in his class? TALK ABOUT THE MATH! ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ ______________________________________________ WRITE THE EQUATION HERE

You have learned to use different tools to help you solve addition and subtraction equations. You have used a number line. You have used a standard or metric ruler. You have used paper to draw your own number line. You have used a hundreds chart or hundreds board. Use whatever tool helps you solve the equations on the following slide.

Determine the unknown number in each equation. Solve for ? 32+ 7 = ? ? = _____ 76- ? = 23 ? = _____ ? + 15 = 90 - 35 ? = _____ 43 + 6 = 17 + ? ? = _____ 88 - 46 = 1 + ? ? = _____ 19 + ? = 47 - 3 ? = _____ 52 + ? = 10 + 61 ? = _____ 48 + 10 + 10 = ? + 2 ? = _____ 50 - 23 + 11 = 16 + ? ? = _____