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Unit 2 - Second Grade Math (click the above document to view the Unit 2 Parent Letter
Example of how to explain DECOMPOSING:
24+32
I used decomposing to solve 24+32.
First I, break apart the tens and ones 20+4=24 and 30+2=32
Next I, add the tens 20+30=50 and add the ones 4+2=6.
Then I, add the tens and ones together 50+6=56.
My answer is 24+32=56.
24+32
I used decomposing to solve 24+32.
First I, break apart the tens and ones 20+4=24 and 30+2=32
Next I, add the tens 20+30=50 and add the ones 4+2=6.
Then I, add the tens and ones together 50+6=56.
My answer is 24+32=56.
Example of a BASE TEN MODEL (without regrouping and with regrouping)
Example of using an Open Number Line:
Unit 2 Math Standards:
MGSE2.OA.1 Use addition and subtraction within 100 to solve one and two step word problems by using drawings and equations with a symbol for the unknown number to represent the problem. Problems include contexts that involve adding to, taking from, putting together/taking apart (part/part/whole) and comparing with unknowns in all positions. Add and subtract within 20.
MGSE2.OA.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers. Use place value understanding and properties of operations to add and subtract.
MGSE2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Work with time and money.
MGSE2.MD.8 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?
MGSE2.MD.10 Draw a picture graph and a bar graph (with single-unit scale) to represent a data set with up to four categories. Solve simple put-together, take-apart, and compare problems1 using information presented in a bar graph
BIG IDEAS
By the conclusion of this unit, students should be able to demonstrate the following competencies:
• Represent and solve problems involving addition and subtraction.
• Solve a variety of word problems involving money using $ and ¢ symbols.
• Understand and apply properties of operations and the relationship between addition and subtraction.
• Recognize how the digits 0-9 are used in our place value system to create numbers and manipulate amounts.
• Understand how addition and subtraction affect quantities and are related to each other.
• Know the multiple meanings for addition (combine, join, and count on) and subtraction (take away, remove, count back, and compare) • Use the inverse operation to check that they have correctly solved the problem.
• Solve problems using mental math strategies.
• Draw and interpret picture and bar graphs to represent a data set with up to four categories.
MGSE2.OA.1 Use addition and subtraction within 100 to solve one and two step word problems by using drawings and equations with a symbol for the unknown number to represent the problem. Problems include contexts that involve adding to, taking from, putting together/taking apart (part/part/whole) and comparing with unknowns in all positions. Add and subtract within 20.
MGSE2.OA.2 Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers. Use place value understanding and properties of operations to add and subtract.
MGSE2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Work with time and money.
MGSE2.MD.8 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?
MGSE2.MD.10 Draw a picture graph and a bar graph (with single-unit scale) to represent a data set with up to four categories. Solve simple put-together, take-apart, and compare problems1 using information presented in a bar graph
BIG IDEAS
By the conclusion of this unit, students should be able to demonstrate the following competencies:
• Represent and solve problems involving addition and subtraction.
• Solve a variety of word problems involving money using $ and ¢ symbols.
• Understand and apply properties of operations and the relationship between addition and subtraction.
• Recognize how the digits 0-9 are used in our place value system to create numbers and manipulate amounts.
• Understand how addition and subtraction affect quantities and are related to each other.
• Know the multiple meanings for addition (combine, join, and count on) and subtraction (take away, remove, count back, and compare) • Use the inverse operation to check that they have correctly solved the problem.
• Solve problems using mental math strategies.
• Draw and interpret picture and bar graphs to represent a data set with up to four categories.