Embedded Files
Unit 2: Numbers Within 100: Addition, Subtraction, Time, and Money
Hundred Chart for clipboards
2 versions of Learning Progression for Unit 2 pdf
Link to spreadsheet with 5 different activities. Place Value, What's the Number, 10/100 More or Less, Addition.
Halloween Theme so didn't want to wait until Unit 3 to share! You can delete tabs and just assign one via Classroom (making a copy for each student). My students love these (and Gemini just taught me how to lock them down so they won't accidentally delete my formulas! TMI 😆
Lesson 6:
Add Two-Digit Numbers
Content Objectives
🎯 I can break apart two-digit numbers into tens and ones as a place-value strategy for
  adding.
🎯 I can recognize that in adding, tens are added to tens and ones to ones.
🎯 I can determine when grouping a ten is necessary and carry out the regrouping to find a
  sum.
🎯 I can estimate sums of two-digit numbers by using easier numbers close to one or both
  addends.
2.NBT.B.5 (MT)Â Â Â Â Â Supporting
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.B.9 (MT) Â Â Â Â Supporting
Add up to four two-digit numbers using strategies based on place value and properties of operations. CC:  Explain why addition and subtraction strategies work, using place value and the properties of operations.
Prior Knowledge
Identify place value in two-digit numbers.
Model two-digit numbers.
Fluently add within 20.
Seesaw Activity: Fluency Practice from Lesson 2
Seesaw Activity: Fluency Practice from Lesson 3 with tools
Seesaw Activity coming
on i-Ready
Lesson 7:
Subtract Two-Digit Numbers
Content Objectives
🎯 I can decompose a ten as a strategy for subtracting.
🎯 I can recognize that addition can be used to solve a subtraction problem.
🎯 I can evaluate mental strategies for subtracting a number from a two-digit number.
🎯 I can estimate differences of two-digit numbers by using easier numbers close to one or
  both numbers being subtracted.
2.NBT.B.5 (MT) Â Â Â Â Â Supporting
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.B.9 (MT)Â Â Â Â Â Supporting
Add up to four two-digit numbers using strategies based on place value and properties of operations. CC:  Explain why addition and subtraction strategies work, using place value and the properties of operations.
Prior Knowledge
Identify place value in two-digit numbers.
Fluently add and subtract within 20.
Apply the commutative property of addition.
on i-Ready
Lesson 8:
Use Addition and Subtraction Strategies with Two-Digit Numbers
Content Objectives
🎯 I can fluently break apart two-digit numbers into tens and ones as a place-value strategy
  for addition and subtraction.
🎯 I can fluently determine when regrouping a ten is necessary and carry out the regrouping
  to find a sum.
🎯 I can fluently determine when decomposing a ten is necessary and carry out the
  decomposition to find a difference.
🎯 I can use addition to solve a subtraction problem.
🎯 I can use addition to check the solution to a subtraction problem.
2.NBT.B.5 (MT)Â Â Â Â Â Supporting
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.B.9 (MT)Â Â Â Â Â Supporting
Add up to four two-digit numbers using strategies based on place value and properties of operations. CC:  Explain why addition and subtraction strategies work, using place value and the properties of operations.
Prior Knowledge
Identify place value in two-digit numbers.
Model two-digit numbers.
Fluently add and subtract within 20.
Apply the commutative property of addition.
2-Digit +- 1-Step Story Problems Self-Checking Seesaw Activity
Seesaw Activity coming
Seesaw Activity coming
Lesson 9:
Solve Word Problems with 2-Digit Numbers
Content Objectives
🎯 I can analyze word problems to determine the operation needed to solve them.
🎯 I can apply the use of fact families as a strategy to solve one-step problems and build number sense.
🎯 I can interpret models that represent a one-step problem with two-digit numbers.
2.OA.A.1 Â Â (Montana) Â Â Â Â Priority
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations within a cultural context, including those of Montana American Indians, of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.Â
Prior Knowledge
Add and subtract within 100.
Use fact families fluently.
Understand addition and subtraction situations involving adding to, taking from, putting together, taking apart and comparing.
Understand how a model represents a numberical situation.
Solve one-step problems involving one-digit numbers.
On Level Center Activity for 2 players
Seesaw Activity
Enrichment Activity from i-Ready Seesaw Activity
Seesaw Activity coming
Lesson 10:
Solving Word Problems Involving 💵 Money
Content Objectives
🎯 I can recognize and name the coins penny, nickle, dime, and quarter.
🎯 I know the value of coins and paper denominations.
🎯 I can count the amount of money represented by a set of coins or bills.
2.OA.A.1Â Â Â (Montana) Â Â Â Â Priority
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations within a cultural context, including those of Montana American Indians, of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.Â
2.MD.C.8Â Â Priority
Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and ¢ symbols appropriately. Example: If you have 2 dimes and 3 pennies, how many cents do you have?
Prior Knowledge
Count by tens.
Fluently add within 100.
Self-Checking Seesaw Activity
Seesaw Activity game for 2 with each on own computer
Seesaw Activity with lots of practice for counting by 5s to 100. Self-checking and AI-correcting assessment.
Seesaw Activity with lots of practice for counting by 10s to 100. Self-checking and AI-correcting assessment.
Lesson 11:
Tell & Write Time
Content Objectives
🎯 I can read time to the nearest 5-minute interval.
🎯 I can write time to 5-minute intervals using proper notation.
🎯 I can show time on an analog clock to 5-minute intervals using proper hour-hand and
  minute-hand placement.
🎯 I can determine when a digital clock should read AM or PM.
2.MD.C.7 Â Â Â Â Priority
Tell and write time from analog and digital clocks to the nearest 5 minutes, using a.m. and p.m..
Prior Knowledge
Tell and write time in hours and half hours.
Skip-count by fives and tens.
Understand the concept of half.
Paper Quiz with Rubric pdf
Self-checking Lesson 11 Quiz in Seesaw. Rubric link on activity.
THIS link is for the Seesaw Activity in Assessment mode, rather than self-checking.
Math in Action
pdfs:  Student    Teacher     Oral Presentation Checklist       Â
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