This making inferences math operations activity helps 4th and 5th grade students use clue words to choose the right operation and solve word problems. An answer key is included for quick checking.

This sorting equations worksheet has 1st graders solve nine addition equations, sort them under the sums 6, 8, and 10, and fill in missing numbers. An answer key is included for easy checking.

This double digit adding without regrouping worksheet has 2nd grade students split each problem into tens and ones, add each part, and find the sum. An answer key is included for fast checking.

This why it works explaining addition and subtraction worksheet has 2nd graders jump by tens and ones on open number lines to add and subtract within 100. An answer key is included.

This adding 3 word problems worksheet gives 1st Grade students five short stories with matching number sentences and an answer key, so counting on three becomes quick and easy.

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.

Using this Frac-Man Fractions Activity, students solve fraction problems to help feed Frac-Man and/or Mrs. Frac-Man.

Using the Adding 1 Song (MP3), students sing and practice adding 1 with all addition facts 1-15. Your kids will learn how to add 1.

Using the Adding 4 Song (MP3), students sing and practice adding 4 with all addition facts 1-15. Your kids will learn how to add 4.

Using the Adding 5 Song (MP3), students sing and practice adding 5 with all addition facts 1-15. Your kids will learn how to add 5.

Using the Adding 11 Song (MP3), students sing and practice adding 11 with all addition facts 1-15. Your kids will learn how to add 11.

Using the Adding 14 Song (MP3), students sing and practice adding 14 with all addition facts 1-15. Your kids will learn how to add 14.

In this Diving for Sums Add Subtract Within 1000 Activity, students add and subtract within 1000 using strategies of their choice.

In this Adding Two Digit Numbers Activity, students add up to four two-digit numbers using strategies based on place value and properties of operations.

In this Monkey Business Adding with an Unknown Number Activity, students find the unknown whole number in addition equations up to 20.

In this Adding Tens and Tens Activity, students will practice adding 10 to a given number to build addition fact fluency.

Using this K.OA.1 Kindergarten Common Core Lesson, students add together two groups of objects and then match to the sum card.

This K.OA.2 Kindergarten Common Core Lesson includes K.OA.2 Worksheets, K.OA.2 Activities, K.OA.2 Assessment, and K.OA.2 Poster.

In this 1.NBT.4 First Grade Common Core Lesson, students will practice adding 10 to a given number.

In this 1.NBT.5 First Grade Common Core Lesson, students practice finding 10 more and less than a given number.