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ACTIVITY
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Problems with an Unknown Start
Solve each problem. Show your work. Write an equation.
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1 Kira had some dolphin stickers. For her birthday, her mom gave her 2 more strips of 10 dolphin stickers. Now Kira has 55 dolphin stickers. How many dolphin stickers did Kira have to start?
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2 Jake had some wizard stickers. He gave 20 wizard stickers to Sally. Now Jake has 28 wizard stickers left. How many wizard stickers did Jake have to start?
Table of Contents
Investigations 3 in Number, Data, and Space®, Student Activity Book
Unit 1 Coins, Number Strings, and Story Problems
Investigation 1
Investigation 2
Investigation 3
Investigation 4
Unit 2 Attributes of Shapes and Parts of a Whole
- Today's Number with 10 Cubes
- 10 Cubes
- About the Mathematics in This Unit
- Ways to Fill: Shape A
- Ways to Fill: Shape B
- Ways to Fill: Shape C
- Ways to Fill: Shape D
- Ways to Fill: Shape E
- Ways to Fill: Shape F
- Today's Number: 10
- Arranging 10 Objects
- About Mathematics Homework
- Exploring Money
- Today's Number: 12
- Missing Numbers 1
- Missing Numbers 2
- Missing Numbers 3
- Missing Numbers 4
- Missing Numbers 5
- Missing Numbers 6
- Counting Strips
- Coins
- What Went Wrong?
Investigation 1
Investigation 2
Investigation 3
Unit 3 How Many Stickers? How Many Cents?
- Linda and Ebony Share Everything
- How Many?
- Build the GeoBlock
- How Many Halves?
- Halves and Not Halves of Rectangles
- Halves on Geoboards
- Halves and Not Halves
- Today's Number: 29
- Circles: Half-and-Half
- Fraction Flags
- Matching Fractions
- Different Shapes: Halves and Fourths
- More Fractions
- Color Them In!
- Matching Fractions 2
- Pizza Fractions
- Fractions All Around Us
Investigation 1
Investigation 2
Investigation 3
Unit 4 Pockets, Teeth, and Guess My Rule
- Practicing the Facts
- How Many Stickers?
- How Many Stickers?
- About the Mathematics in This Unit
- 46 Stickers
- 53 Stickers
- How Many Stickers? 2
- Dimes and Pennies: How Many of Each?
- Strips and Singles: How Many of Each?
- Problems about Money
- How Many Cubes?
- Kira's Sticker Book
- How Many More?
- More Pages in Kira's Sticker Book
- How Many of Each?
- Solving a Sticker Problem
- How Many More?
- Story Problems about Roll-a-Square
- Roll-a-Square Problems
- More Roll-a-Square Problems
- Scores in Close to 20
- Close to 20 Problems
- Close to 20 Recording Sheet
- Close to 20 Directions
- Sticker Problems
- Soccer Stickers
- The Clock
- More Sticker Problems
- Cat Stickers
- Get To 100
- Story Problems about Stickers
- Time: Hours and Half Hours
- Did They Get To 100?
- Counting Coins
- Related Activities to Try at Home
- Do You Have $1.00?
- Sticker Problems at Home
- How Many Stickers?
- Today's Number: 56 with Coins
- Problems with an Unknown Change
- How Many Balloons?
- How Many Sheets? How Many Stickers?
- Sticker Problems
- Groups of 10
- Fish Stickers
- Problems with an Unknown Start
- How Many Balloons? 2
- Missing Numbers: Equations on the 100 Chart
- Missing Numbers: Equations on the 200 Chart
- Missing Numbers: Equations on the 300 Chart
- Missing Numbers: Equations on the 400 Chart
- Missing Numbers: Equations on the 500 Chart
- Plus or Minus 10
- Star Stickers
- Missing Numbers: Equations on the 100 Chart 2
- Missing Numbers: Equations on the 200 Chart 2
- Missing Numbers: Equations on the 300 Chart 2
- Missing Numbers: Equations on the 400 Chart 2
- Missing Numbers: Equations on the 500 Chart 2
- What Time Is It?
- Today's Number: 12 with Missing Parts
Investigation 1
Investigation 2
Unit 5 How Many Tens? How Many Hundreds?
- How Many Pockets?
- Guess My Rule Story Problems
- About the Mathematics in This Unit
- Today's Number: 12
- Guess My Rule with Letters
- Striped Shirts
- Related Activities to Try at Home
- How Many Flowers?
- Guess My Rule at Home
- Circle for Guess My Rule
- Venn Diagram for Guess My Rule
- Weekend Activity Data
- Favorite Sports
- Guess Both of My Rules!
- Today's Number: 20
- Pocket Data from Our Class
- Zoo Animals
- How Many Pockets in All?
- Our Plan for Collecting Data
- Looking at a Line Plot
- How Many Teeth?
- Looking at a Line Plot 2
- Practicing the Facts
- What Did You Find Out?
- Explaining Someone Else's Findings
- Looking at a Line Plot 3
- How Many Pockets? 2
- Mystery Teeth Data: Which Class Is It?
- Mystery Teeth Data: Which Class Is It? Recording Sheet
- Representing Data
- Today's Number: 18
- Coin Problems
Investigation 1
Investigation 2
Investigation 3
Unit 6 How Far Can You Jump?
- Plus 9 or Minus 9 Bingo Problems
- About the Mathematics in This Unit
- Capture 5 Problems
- How Many Stickers? How Many More to 100?
- How Many More?
- Plus 9 or Minus 9 Bingo Gameboard
- Plus 9 or Minus 9 Bingo Directions
- Ways to Make a Dollar
- Today's Number with Coins
- How Many More to 100? How Much More to $1.00?
- Problems for Capture 5
- Writing Equations for Capture 5
- Telling Time
- Practicing the Facts
- Today's Number: 100
- Sums That Equal 100
- How Many Pockets?
- How Many Stickers?
- Comparing Stickers
- How Many Stickers? 2
- How Many Stickers?
- Problems for Close to 100
- Find the Number
- Plus or Minus 10, Plus or Minus 100
- Find the Number 2
- Today's Number: Guess the Number
- 3-Digit Numbers
- Related Activities to Try at Home
- Addition Problems, Set 1
- Addition Problems, Set 2
- What Time Is It?
- Addition at Home
- Comparison and Addition Problems
- Counting by 5s
- Comparison and Addition Problems 2
- Fact Practice
- More Than/Fewer Than Problems
- Solving Problems by Adding Tens and Ones
- Comparison and Addition Problems 3
- Going to the Movies
- Solving Problems by Adding On in Parts
- Comparison and Addition Problems 4
- Counting by 5s and 10s Again!
- Prize Tickets
- Today's Number: 200
- Enough for the Grade?: Bean Bags
- Enough for the Grade?: Cupcakes
- Stickers in 4 Groups
- How Many Pockets?
- Enough for the Grade?: Pencils
- Enough for the Grade?: Ice Pops
- Plus 9 or Minus 9 Bingo Problems
- Today's Number: Guess the Number
Investigation 1
Investigation 2
Unit 7 Partners, Teams, and Other Groups
- How Far Can You Jump?
- Time to the Quarter Hour
- About the Mathematics in This Unit
- Comparing Jumps
- Measuring with Pencils
- Measuring Jumps with Cubes
- A Jumping Contest
- How Much Longer?
- Jumping in the Land of Inch
- Bullfrog Jumps
- Measuring with Inch-Bricks at Home
- Clothes in the Land of Inch
- Buildings in the Land of Inch
- Inch-Brick Tool Measurements
- Practicing the Facts
- Grasshopper Jumps
- Related Activities to Try at Home
- Rulers and Inch-Brick Measuring Tools
- Body Benchmarks
- Measure and Compare
- Inch-Brick Tool Measurements 2
- Comparing Measurements
- Measuring Our Classroom
- Measuring Jumps in Inches
- Room Comparisons
- Length and Width
- Metric Scavenger Hunt
- Inches and Centimeters: Comparing Tools
- Metric Measurements
- Metric Scavenger Hunt at Home
- Measuring Jumps in Centimeters
- Rabbit Jumps
- Inches and Centimeters: Measuring
- Jumps in Centimeters
- More Practicing the Facts
- Cat Comparisons
Investigation 1
Investigation 2
Unit 8 Enough for the Class? Enough for the Grade?
- Partners and Teams
- How Many Pockets?
- Problems about Partners and Teams
- About the Mathematics in This Unit
- Every Hour on the Hour
- Linda and Ebony Share
- Questions about Even and Odd Numbers
- Odd or Even?
- Practicing the Facts
- Bunches of Balloons
- Sharing Pennies
- How Many Flowers?
- Partners and Teams in Grade 2
- A Cube Building
- Close to 100
- Related Activities to Try at Home
- Cube Buildings 1
- Cube Buildings 2
- Today's Number: 50
- Cube Buildings 3
- Cube Buildings 4
- 5 Rooms on a Floor
- Counting by Groups
- Pairs of Socks
- Floor Plan 1
- Floor Plan 2
- Floor Plan 3
- Floor Plan 4
- Floor Plan 5
- Telling Time
- Covering Hexagons
- Mystery Shape 1
- Mystery Shape 2
- Mystery Shape 3
- Mystery Shape 4
- Mystery Shape 5
- Mystery Shape 6
- Mystery Shape 7
- Mystery Shape 8
- Cube Buildings
- Practice with Arrays
- How Do You Get to 100?
Investigation 1
Investigation 2
- Story Problems about Comparing
- What Time Is It?
- About the Mathematics in This Unit
- Story Problems about Comparing 2
- Story Problems about Comparing
- Story Problems about Comparing 3
- What's a Clue?
- Paper Clips
- What Time Is It? 2
- Enough for the Grade?: Pencils and Erasers
- Story Problems about Comparing 2
- Enough for the Grade?: Crayons and Pencil Cases
- The Missing Fruit Mystery
- Pennies and Paper Clips
- Story Problems
- Matching Times to Pictures
- Story Problems 2
- How Many Stickers?
- Pennies and Stickers
- Picking Blueberries
- Stickers to Share
- Paper Clip Problems
- Frog Stickers
- Combining Sets of Stickers
- Hundreds, Tens, and Ones
- Related Activities to Try at Home
- Hundreds of Pencils and Stickers
- Combining Sets of Stickers
- Enough Pencils for the Grade?
- Matching Facts
- Combining Sets of Stickers
- Combining Stickers and Enough for the Grade?
- How Many Stickers?
- Enough for the Grades?
- Matching Facts 2
- Cover Up at Home
- Subtracting Groups of Stickers
- How Many Baseball Stickers?
- More Sticker Problems
- How Many Sailboat Stickers?
- How Many Stickers?
- How Many Stickers?
- Jake's Stickers
- Today's Number: 500
- Today's Number: Guess the Number