Independent

Games & Activities:

• Practice counting to 120.
• Choose a number that is greater than 10 and less than 100. Represent that number using a base ten sketch.
• Fill out a blank 100s chart.  Highlight patterns.
• On a sentence strip practice writing numbers beyond 100.
• Write your own missing parts story problem. (8 + __ = 13)
• Practice +/- multiples of 10 to a double digit number. (ex: 13+20, 45-30, 31+10)

• Doubles Cover Up

• Four in a Row with Near Doubles
• Two Digit Addition Split
• Make 100

Worksheets:

• Free Download 1-120 Sheets
•  120 Chart with blanks to fill in
• Cut up the 120 Chart into pieces then put the puzzle back together. Try it again to see if you can put it back together even faster!
• Common Core Worksheets

Videos:

• Brainpop Jr – Adding and Subtracting Tens

PS11Showme Videos:

• Base Ten Sketch
• Open Number Line
• Keep One Break One
• Keep One Break One – Double Digit
• Keep One Break One Two & Three Digit Numbers    

Online Games (Websites & Apps):

• ABCYA (Select ones and tens)
• Interactive Hundreds Chart
  • Color all the numbers you say when you count by 5s
  • Color all the numbers you say when you count by 10s
• ABCYA – Guess the Number – Select Medium (1-100)

Apps:

• Sushi Monster free
• Math Duel free
• Electric Sums $

Family

Games & Activities:

• Teach a family member how to play ten plus any two digit number.  
• Use the members of your family to create a story problem about a problem you had that day
• Play with a family member the card game “War.”  
• Play “I Have, Who Has”
• Create a Tic Tac Toe board with a two digit addition or subtraction equation in each box. In order to put your “X” or “O” you must solve the problem and have your partner check your work.
• Teach a family member an addition or subtraction strategy (Expanded Form, Base 10 Sketch, Open Number Line, Keep One Break One). Then give them a list of problems to solve. Check their work!

Projects:

• A student subtracts a 2-digit number from a 2-digit number and says the difference is 20. Both the 2-digit numbers end in zero. What might the two numbers be?

Extension

• Solve a two digit addition or subtraction problems using as many strategies as you can! Create a poster to share your strategies.  Can you use all four?
  • Expanded Form
  • Base 10 Sketch
  • Open Number Line
  • Keep One Break One

Reflect: Which strategy was the most efficient strategy to use?

• While grocery shopping, keep track of the total amount your family is spending on food by adding the prices of each item to the nearest whole number.
• Grouping and Grazing
• Basically Base Ten: Discovering Place Value Meaning Using Base Ten Blocks
• Toy Shop Numbers