1st Grade - Understand Addition And Subtraction

 
     
 
     
 
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1st
Addition and Subtraction
Understand Addition and Subtraction
Show the meaning of addition (putting together, increasing) and subtraction (taking away, comparing, finding the difference).
 

Sample Problems

(1)

If you have 2 apples and get 2 more, how many do you have? (4)

(2)

If you have 3 candy bars and eat 1, how many do you have left? (2)

(3)

2 friends are playing handball and 1 more friend joins. How many are playing now? (3)

(4)

10 leaves are on a tree. 2 fall off. How many are left? (8)

(5)

You have 2 pages of homework. You finished one. How many do you have left? (1)

Learning Tips

(1)

Candy Fun: One of the best ways to reinforce the concept of addition and subtract is through the use of food, especially candy! Go to the store and purchase your child’s favorite candy. You can use it to demonstrate the concept that when you are adding something you are gaining more. You can also demonstrate that when you are subtracting you are taking things away (or eating in this case). You can do simple word problems and ask your child to show you what the problem represents using the candy. For example you can say, “You have 3 Hershey’s Kisses. Your brother comes along and eats one. How many do you have left?” At this point your child would need to manipulate the candy to show3-1=2. You will also need to discuss that fact that when something is being taken away it is subtraction and when something is being added to it is addition.

(2)

Toy Adding and Subtracting: With this activity your child will be able to practice two skills at once. They will add and subtract their toys, while cleaning up their rooms! The next time you ask your child to clean up their room, go with them and play a little addition and subtraction game. First, have them group the toys into like groups. Next manipulate the toys to show simple addition and subtraction problems. Your child will practice adding and subtracting and their room will get clean!

(3)

Nature Walk Treasures: One of the best ways to practice the skills of addition and subtraction is to use objects to represent the problem. This adds a visual and tactile component to the learning of these concepts. Invite your child to go on a nature walk with you. While you are on this walk, have your child collect a variety of “treasures” in a brown paper bag. Some of these things may include, leaves, rocks, sticks, pine cones, etc. When you return home from your outdoor adventure, use the “treasures” collected to demonstrate simple addition and subtraction problems.

(4)

Play Dough Squish and Roll: For this activity, you will need play dough, a mat to work on, and simple addition and subtraction flashcards. Show your child a flashcard and ask them to read the problem to you. After they have read the problem ask them to roll the dough into balls to represent the problem on the flashcard. For example, if the problem on the card say 3+1, your child will need to shows 3 balls of play dough on the left side of their mat and 1 ball of play dough on the right side of their mat. Next, they will need to look at the addition sign on the flashcard and determine that they are to add to the balls together. They will show this by moving all of the balls into one pile and counting them to determine the correct answer of 4. Now, if your child has a subtraction problem, such as 6-2, then your child will need to read the problem and determine what to do. They will start by rolling 6 balls of play dough. Next, they will determine that they need to subtract, so they will be taking 2 balls away. They can demonstrate this concept by “squishing” 2 balls and counting the remaining 4 to obtain the correct answer to the problem.

(5)

Watermelon Math: For this activity you will need pink and green craft sticks. They can be purchased at your local craft store. You will also need a black marker, paper, and a pencil. On the craft stick you will need to draw watermelon seeds. On each stick draw an amount of seeds between the amounts of 1-9. Place the pink sticks in one cup and the green sticks in another cup. On the paper ask your child to draw a slice of watermelon (half circle) on the left side of their paper. In the middle ask them to make an addition sign and ask them to draw another slice of watermelon on the left side of their paper. Next, have them pick a craft stick and count the number of seeds on the stick. Have them draw the number of seeds that are on the stick on the watermelon slice on the left side of the page. Have them replace their first stick and choose another. They will need to count the seeds on this stick and draw the corresponding number of seeds on the watermelon slice on the right side of the page. After they have completed both sides of the problem, have your child count all of the seeds to complete the addition problem. They can repeat the same process for subtraction. They will need to cross out the seeds that will need to be subtracted or taken out of the problem.

Extra Help Problems

(1)

What are you doing when you add objects? (putting them together)

(2)

What are you doing when you subtract objects? (take things away)

(3)

A bird is sitting on a branch of a tree. 2 more birds come and sit on the branch? Do you need to add or subtract to solve this problem? (add)

(4)

A bird is sitting on a branch of a tree. 2 more birds come and sit on the branch? How many birds are sitting on the branch now? (3)

(5)

There are 3 pieces of cake left over from the birthday party. You eat one. Is this an addition or subtraction problem? (subtraction)

(6)

There are 3 pieces of cake left over from the birthday party. You eat one. How many are left? (2)

(7)

I read 2 books this weekend. I want to read 2 more. How many books will I have read all together? (4)

(8)

I read 2 books this weekend. I want to read 2 more. Is this an addition or subtraction problem? Are you adding things together or taking things away? (adding)

(9)

2+3= (5)

(10)

6-2= (4)

(11)

5+3=( 8)

(12)

2-1= (1)

(13)

7+1= (8)

(14)

8-4= (4)

(15)

My mom gave my two presents for my birthday. My grandma gave me 2 more. How many presents do I have all together? (4)

(16)

My mom gave my two presents for my birthday. My grandma gave me 2 more. Is this an addition or subtraction problem? Are you adding things together or taking them away? (addition, adding together)

(17)

I was playing with 7 blocks. My friends came and took 2 of my blocks. How many blocks do I have left? (5)

(18)

I was playing with 7 blocks. My friends came and took 2 of my blocks. Does this problem require addition or subtraction? Are you putting things together or taking things away? (subtraction, taking things away)

(19)

5-3= (2)

(20)

3-2= (1)

(21)

2+1= (3)

(22)

7-1= (6)

(23)

8+0= (8)

(24)

4+3= (7)

(25)

6-1= (5)

 

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