2nd Grade Subtraction Within 100 Lesson Plans

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Features

The goal and its "I can" line, what to get ready and the words to use
A 45 minute lesson in five steps (warm up, teach with words to say, try it together, practice, exit ticket)
Questions to ask, and the mistakes students make and what to do about them
Ideas for students who need help or are ready for more
Each plan ends with the Animal Math worksheets, worksheet makers, tools and quizzes for that lesson
Lessons: subtracting tens and counting back by tens, subtracting on an open number line, subtracting by place value, breaking apart the number you take away, breaking a ten with blocks and quick drawings, subtracting in columns with regrouping, counting up and checking by adding, subtracting from 100 and from tens, and missing numbers
Lesson 5.10 (estimate to check a difference) for the states that teach it in 2nd grade

2nd Grade Math CurriculumUnit 5

These are the lesson plans for Unit 5 of 13 in the 2nd Grade Math Curriculum: 128 lessons in teaching order, week by week, each with a lesson plan and an exit ticket.

← Previous unitUnit 4: Addition Within 100 Next unit →Unit 6: Word Problems

Also for this unit: this unit’s exit tickets and this unit’s test. See the whole year

Resources for Each Lesson

Everything each lesson plan points to, with links. Sheet numbers count worksheets: a color pack prints each sheet again in black and white.

5.1 Subtract tens, count back by tens

PrintableAdding and Subtracting Tens: sheet 5, for review
PrintableTen More and Ten Less: sheet 4, for early finishers
MakerHorizontal Math Equations: Operations −, Range Within 100, Tens Only, Numbers Second Number (34 + 20)
ToolHundreds Chart: Click a Number To: See 10 More and 10 Less
QuizAdd and Subtract Within 100 Quiz: the Tens level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.1

5.2 Subtract on an open number line

Printable2-Digit Subtraction Strategies: sheet 3
MakerNumber Line: Mode Subtraction on Number Line, Number Range 1 to 100
ToolNumber Line: Start 60, End 100, then Jump
QuizSubtraction Within 100 Quiz: the Strategies level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.2

5.3 Subtract by place value

Printable2-Digit Subtraction Strategies: sheet 1
MakerColumn Math Equations: Operations −, Range Within 100, Set Digit Count, Digits 2 digits, Regrouping / Borrowing off
ToolBase Ten Blocks
QuizSubtraction Within 100 Quiz: the No Regrouping level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.3

5.4 Break apart the number you take away

PrintableDecompose to Subtract - 2-Digit Guided: sheets 1-2
PrintableDecompose to Subtract - 2-Digit Open: sheet 1
MakerDecompose to Subtract: Digit Mode 2-Digit, Decomposition Style Guided (One Part Pre-Filled), then Open-Ended (All Blanks)
ToolNumber Line: Start 20, End 80, then Jump
QuizSubtraction Within 100 Quiz: the Strategies level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.4

5.5 Break a ten with blocks and drawings

Printable2-Digit Subtraction Strategies: sheet 2
MakerBase-ten Values: Mode Many Ways, Number Range 10 to 100
ToolBase Ten Blocks: select a ten and press Break Apart
QuizSubtraction Within 100 Quiz: the Regrouping level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.5

5.6 Subtract in columns with regrouping

MakerColumn Math Equations: Operations −, Range Within 100, Set Digit Count, Digits 2 digits, Regrouping / Borrowing on, Mix All
PrintableColumn Math to 100: the subtraction problems on sheet 2
ToolBase Ten Blocks: select a ten and press Break Apart
QuizSubtraction Within 100 Quiz: the Regrouping level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.6

5.7 Count up to subtract, check by adding

Printable2-Digit Subtraction Strategies: sheet 4
ToolNumber Line: Start 40, End 90, then Jump
ToolHundreds Chart
QuizSubtraction Within 100 Quiz: the Strategies level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.7

5.8 Subtract from 100 and from tens

Printable2-Digit Subtraction Strategies: sheet 5
PrintableMake 100: sheet 3, for early finishers
ToolBase Ten Blocks: add a hundred, select it and press Break Apart
ToolHundreds Chart
QuizSubtraction Within 100 Quiz: the Strategies level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.8

5.9 Missing numbers within 100

PrintableFill in the Blank - Equations to 100: sheets 1-2
MakerFill in the Blank Equations: Operations + and −, Range Within 100, Position Mixed
ToolBase Ten Blocks
QuizSubtraction Within 100 Quiz: the Missing Numbers level
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.9

5.10 Estimate to check a difference ★

PrintableEstimate to Add & Subtract: sheets 3-4
MakerRounding Numbers: Round to Nearest 10, Show Number Line Hint
ToolNumber Line: Start 0, End 100, Interval 10
Exit ticket2nd Grade Subtraction Within 100 Exit Tickets: Exit Ticket 5.10

★ Taught in 2nd grade in some states.

Skills Covered

Subtract tens; count back by tens
Subtract on an open number line
Subtract the tens and the ones
Break apart the number you take away
Break a ten with blocks and quick drawings

Subtract in columns with regrouping
Count up to subtract, check by adding
Subtract from 100 and from tens
Missing numbers within 100
Estimate to check a difference

How to Use This Pack

Ten lesson plans, one for each lesson of a 2nd grade unit on subtracting within 100, in teaching order, after an overview page that lays the unit out day by day: a pre-check, the ten lessons, a review and the unit test. Each plan fits on one page. It gives the goal, what to get ready, the words to use, the lesson in five steps with the words to say, questions to ask, common mistakes and what to do about them, and the Animal Math worksheets, makers, tools and quizzes for the lesson.

In the Classroom

Print the unit, or just the day's page, and teach from it. Each lesson takes about 45 minutes: a 5 minute warm up, 10 minutes of teaching, 10 minutes together, 15 minutes of practice and an exit ticket at the end. The exit tickets and the unit test are separate packs, made for these lessons. Lesson 5.10 (estimate to check a difference) is for the states that teach it in 2nd grade.

At Home

Teaching at home? Use the warm up and the "Try it together" step as a short lesson, and the "Words to use" as the way to talk about it. Bundles of ten straws or craft sticks work as well as base-ten blocks: snap a band off a bundle to break a ten. The mistakes to watch for are the ones most children make.

Tips for Success

Read the "Watch for" box before the lesson: it is what to listen for while students work
Keep base-ten blocks and a hundreds chart on the tables for the whole unit
Ask "Are there enough ones?" before every subtraction
Have students check each answer by adding
Sort the exit tickets into got it, almost and not yet to plan the next day

Common Core Standards Alignment

This pack supports the following Common Core State Standards for Mathematics:

1.OA.B.4 Treat subtraction as finding a missing addend: to solve 12 - 9, ask what added to 9 makes 12.
1.OA.D.8 Solve for the missing number in adding or subtracting equations like 9 + ? = 15 or ? - 4 = 6.
2.NBT.B.5 Add and subtract to 100 fluently with place-value strategies, properties of addition, or the link between adding and subtracting.
2.NBT.B.6 Find the sum of two, three or four two-digit numbers using place value and properties of addition.
2.NBT.B.7 Add and subtract to 1,000 with models and place-value strategies, working hundreds, tens and ones separately and regrouping tens or hundreds as needed.
2.NBT.B.9 Tell why an adding or subtracting method gives the right answer, reasoning from place value and number properties.
2.MD.B.6 Show whole numbers as distances from 0 on an evenly marked number line, and show sums and differences up to 100 as jumps on it.
3.NBT.A.1 Use place value to decide which ten or hundred a whole number is closest to, and round to it.

Features

2nd Grade Math CurriculumUnit 5