In this 2.NBT.8 Second Grade Common Core Lesson, students mentally add and subtract 10 or 100 from a given number 100–900.

Monster math triple digit subtraction activity for 2nd and 3rd grade: match 24 monster problem cards to cookie answers, with a recording sheet and answer key included.

This Let's Workout Our Brain Add Subtract Within 20 activity gives 1st-2nd grade students two mental math card games, a score sheet and a practice page, with an answer key included.

This add and subtract with frogs activity has 1st and 2nd Grade students flip lily pad cards and spin to add or subtract within 20, with a record sheet, practice page and answer key included.

This subtracting with measures worksheet gives 2nd graders five length word problems to model and solve with subtraction, keeping the unit on every answer. An answer key is included.

Using Adding to Make 10 Activity, students match addition equation cards with missing addend cards to show equations that make 10.

In this 2.MD.6 Second Grade Common Core lesson, students will add and subtract within 100 on a number line.

In this 2.NBT.5 Second Grade Common Core lesson, students fluently add and subtract within 100 using multiple strategies.

Using Subtract Five Matching Worksheet, students solve subtracting five equations and then match equations to answers.

This popcorn mental math activity lets 2nd and 3rd grade students add and subtract 10 and 100 in their heads with a fun partner card game, recording sheet, and practice page. Answer key included.

This diving for sums add subtract within 1000 activity gives 2nd and 3rd Grade children 16 clip cards, a Dive Log and a practice page, with an answer key included for fast checking.

The Valentine's Day Fact Families Worksheet gives 2nd grade students three number triangles with a missing number and four facts to finish, building addition and subtraction fluency together. Answer key included.

This Triple Digit Subtracting No Regroup Worksheet gives 2nd grade students six column problems in a labeled place value chart plus two word problems, with no borrowing anywhere. An answer key is included.

In this Let's Go on a Trip Addition Subtraction Within 100 Activity, students add and subtract within 1000, using concrete models or drawings and strategies.

In this 2.MD.4 Second Grade Common Core Lesson, students willmeasure to determine how much longer one object is than another.

This 2.NBT.9 Second Grade Common Core Lesson includes 2.NBT.9 Worksheets, 2.NBT.9 Activities, 2.NBT.9 Assessment, and 2.NBT.9 Poster.

Using Subtraction BINGO, students play BINGO to solve subtraction problems to 20 and build fact fluency.

Use this double digit subtraction no regroup worksheet to help 2nd grade students subtract tens and ones in column problems and word problems. An answer key is included for quick checking.

Using Pirate Addition to 12 Activity, students match addition equation cards with sum cards to build addition fact fluency skills.