ADDITION AND SUBTRACTION

Addition  “Finding the total, or sum, by combining two or more numbers.” You can use pictures and models to demonstrate addition! Definition of addition retrieved from

Key Words for Addition “in total” “what is the sum” “in all” “combined with” “all together”

Layout for Solving Addition Problems  STORY PROBLEM TO FIND ANSWER 1. Find key word in story problem 2. Draw picture 3. Record using numbers and symbols 4. Solve

Example  Betty has three apples. She picks two more off the tree. How many apples does Betty have all together?  SOLUTION 1. KEY WORD: “all together” 2 apples plus 3 apples equals 5 apples 2+3=5 Red apple image from

Example  Sam has four bananas. Tim has two bananas. How many bananas are there in total?  SOLUTION 1. KEY WORD: “in total” Four bananas plus 2 bananas equals 6 bananas 4+2=6 Banana image retrieved from Google Images KNG3tge8t52rBw&zoom=1&iact=rc&dur=690&page=1&tbnh=138&tbnw=101&start=0&ndsp=18&ved=1t:429,r:14,s:0 &tx=64&ty=56

Example  On the playground, Tom found six ants on the ground. Olivia found four ants on the ground. How many ants are there in all?  SOLUTION 1. KEY WORD: “in all” Six ants plus four ants equals ten ants 6+4=10 Picture of ant retrieved from Google Images QG6qfH8Dw&sa=X&oi=mode_link&ct=mode&cd=2&ved=0CD0Q_AUoAQ&biw=1280&bih=709

Subtraction  “Taking one number away from another.” You can use pictures and models to demonstrate subtraction! Definition of subtraction retrieved from

Key Words for Subtraction “difference” “fewer” “how many more” “how much more” “left” “less”

Layout for Solving Subtraction Problems  STORY PROBLEM TO FIND ANSWER 1. Find key word in story problem 2. Draw picture 3. Record using numbers and symbols 4. Solve

Example  Cody has eight oranges. He eats three of them. How many oranges are left?  SOLUTION 1. KEY WORD: “how many left” Eight oranges minus three oranges equals five oranges 8-5=3 Picture of orange retrieved from Microsoft Word clip art

Example  Patty has nine pencils. Three people asked to borrow a pencil from her today. How many pencils does she have left?  SOLUTION 1. KEY WORD: “how many left” Nine pencils minus three pencils equals six pencils 9-3=6 Picture of pencil retrieved from Microsoft Word clip art

Example  Tim has four dollars. Courtney has one dollar. How much more money does Tim have?  SOLUTION 1. KEY WORD: “how much more” $$$$ $ $$$ Four dollars minus one dollar equals three dollars 4-1=3

ADD OR SUBTRACT?  How do you know? LOOK FOR KEY WORDS!!! Taking away or joining together?

Example: Addition or Subtraction?  Cindy has five tennis balls. She loses one. How many fewer tennis balls does she have?  SOLUTION 1. KEY WORD: “how many fewer” 2. Addition or Subtraction?

Example: Addition or Subtraction?  Chloe has seven pairs of shoes. She buys three more pairs. How many pairs of shoes does Chloe have in total?  SOLUTION 1. KEY WORD: “in total” 2. Addition or Subtraction?

Review  Addition: joining together  Subtraction: taking away  LOOK AT KEY WORDS  DRAW PICTURES And last but not least, remember…..