Worksheet
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Add Decimals Mentally (2)

For Students 4th - 6th
In this decimal addition learning exercise, students solve 5 problems that require them to use mental math to add decimals. Students also solve 5 problems that require them to fill in the blanks with missing decimal addends.
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Complete Number Sentences

For Students 3rd - 4th
In this addition activity, students solve 14 problems in which the missing addend in an addition problem is filled in. All problems will have a sum of 100.
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Adding two numbers

For Students Pre-K - K
For this addition worksheet, students complete 4 problems where they have to add two single digit numbers less than 10 together to find the sum. 
Lesson Plan
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Addition and Subtraction Facts to 20

For Teachers 2nd - 3rd
Students act out computation problems. In this addition and subtraction lesson, students act out an addition story and write an addition sentence for it. Students continue this activity and answer the provided questions.
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Probability

For Students 8th
In this probability worksheet, 8th graders solve and complete 15 different problems related to determining the probability of various events. First, they complete the table illustrated on the sheet. Then, students use the table to...
Worksheet
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Number Puzzlers

For Students 3rd
In this math riddle worksheet, 3rd graders find the pair of numbers for each puzzler and write the letter for the pair of numbers in each blank at the bottom of the worksheet page. Students then solve the riddle.
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Adding Tens

For Students 1st - 2nd
In this math worksheet, students solve thirty addition problems. In each problem, students add two different two-digit numbers.
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Make 20

For Students 1st - 3rd
In this making 20 worksheet, students determine pairs of numbers that added together make 20. In this fill in the blank worksheet, students solve thirty-four problems.
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Twist and Check Times Tables

For Students 3rd - 5th
In this math instructional activity, learners look for the solutions to the multiplication tables and use the game cards to complete the problems.
Interactive
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Twenty Objects Trick

For Students 11th
In this math learning exercise, 11th graders put 20 objects in the table and remove different item at different intervals. They recap how many item they removed total. There are 6 questions with an answer key.
Lesson Plan
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Hop to It

For Teachers 1st
First graders play a game of hopscotch, but hop to the answer of the addition or subtraction fact the teacher calls out.
Lesson Plan
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Using 10 to Add 7, 8, and 9

For Teachers 3rd - 4th
For this using ten to add to seven, eight and nine worksheet, learners, working with a partner, practice adding various numbers to the number ten for mastery.
Lesson Plan
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Modeling and Recording Subtraction

For Teachers K
Students practice subtracting numbers from one through ten. In this subtraction activity, students use counters and a workmat to complete several subtraction problems on an overhead projector.
Lesson Plan
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Inverse Relationship Between Addition and subtraction

For Teachers 1st
First graders review number facts to illustrate the relationship between addition and subtraction. In this inverse relationship lesson plan, 1st graders write an addition sentence and then invert the numbers to show the subtraction fact.
Worksheet
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Find the Sum

For Students 1st
For this addition worksheet, 1st graders find the sums for the addition problems. Students solve 18 problems and may color the images of the Halloween ghosts for fun. Students' objective is to enhance their addition skills.
Worksheet
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Arithmetic Series, Geometric Series, Partial Sums of Geometric Series

For Students 11th - 12th
In this Algebra II/Pre-calculus learning exercise, students solve problems that involve arithmetic series and infinite geometric.  Students determine the partial sums of a geometric series. The three page learning exercise contains...
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Math Lesson 16

For Students 1st
In these math lessons worksheets, 1st graders practice their math skills of double digit addition by completing the 20 pages of equations. Students use the carrying method to solve the problems.
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Math Practice Series Worksheet #3

For Students 1st
In this mathematics learning exercise, 1st graders solve numerous addition problems by adding single and two-digit numbers to each other. There are 36 problems to solve on the sheet.
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Math Practice 2

For Students 1st - 3rd
In this math worksheet, students practice using the operation of addition to create the new sums from the word sentences. The answers are on page two.
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Sum Choice

For Students 9th - 10th
In this algebraic thinking worksheet, students are provided with the challenge of finding the sum of 100 by adding up a given list of 2 digit numbers. This worksheet contains 1 problem to solve and the solution.
Worksheet
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Understand Subtraction and its Relationship to Addition

For Students 3rd - 5th
In this subtraction and addition worksheet, students calculate the answers to the subtraction problems and then check their answers using addition. There are 18 problems to solve on this worksheet.
Lesson Plan
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Not So Snappy 10

For Teachers 4th - 5th
In this math worksheet, students look for the answers to each word problem that is focused around the number 10. They use the basic skills of arithmetic.
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Subtraction Numbers to 9

For Teachers 3rd - 4th
In this math worksheet, students find the answers to the 30 subtraction problems. The solutions can be checked by using addition.
Worksheet
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Math Vocabulary Fill-In Puzzle

For Students 4th - 6th
For this math vocabulary puzzle, students use a set of definition clues given to solve a crossword puzzle. A reference web site is given for additional activities.