Curated OER
Estimating Sums and Differences
Work on rounding, estimating, adding, and subtracting with a helpful math instructional activity! Fifth graders study different sets of addition and subtraction problems, and after rounding each number to the leading digit, they estimate...
EngageNY
Sums and Differences of Decimals
Sometimes dealing with decimals is so much easier than dealing with fractions. The ninth lesson in a 21-part module has the class consider situations when it might be easier to add or subtract fractions by first converting to...
Curated OER
Estimating Sums of Money
By rounding, scholars find that adding money amounts becomes a breeze! They round two and three-digit numbers (with decimals) in these addition problems to get approximate sums. For each, mathematicians write the new addition equation...
CK-12 Foundation
Add and Subtract Decimals with Front-End Estimation: Wooden Beams
A six-question interactive tasks mathematicians to solve addition and subtraction problems using front-end estimation. Question types consist of multiple-choice and true or false. A set of wooden beams that can be measured using moveable...
For the Teachers
$1 Math
Captivate your class by having them find the value of their names, different zoo animals, musical instruments, etc.,with a mental math lesson. Using the coding formula listed, children learn to fluently estimate and calculate...
Curated OER
What Do You Think?
In this estimating sums and differences worksheet, students solve 6 problems in which the answer to a 3 digit addition or subtraction problem is estimated. Students then solve the problem for an exact answer. There will be carrying and...
Pedago Net
Acing Math
Deal me in! Elementary and middle school classes will love this selection of math games, all involving a deck of cards. From fractions to exponents to rounding up and down, the games cover such a variety of skills that your classroom...
Curated OER
Number Sense
First graders practice rounding 4 digit numbers using place value concepts. In this estimating sums and differences lesson, 1st graders explore clustering, rounding, and front end estimation as methods for rounding decimals.
Under the Dome
The Candy Bowl
Wonder how many pieces of candy a teacher can eat. Pupils watch a video of candy in a bowl as some candy is removed to be eaten and others are added. Learners devise questions about the situation along with estimated solutions. Scholars...
Curated OER
Study Buddies: Adding Decimals
In this math worksheet, young scholars will work with a coach to add numbers with decimals to the hundredths place. Students will follow a step-by-step process and notes are provided for the coach.
Curated OER
Estimating Sums
In this estimating sums worksheet, students, working with a partner, practice problem solving five word problems involving estimation.
Curated OER
Estimating and Rounding
In this estimation and rounding worksheet, students solve ten multiplication problems by using estimation and rounding skills. This is an interactive worksheet.
EngageNY
Decimal Expansions of Fractions, Part 1
Is it possible to add infinitely long decimals? As pupils complete the examples in the ninth lesson of this 25-part series, they determine that adding these decimals cannot be done without error. Their task is then to determine the size...
Curated OER
Estimating the Cost of Shopping
In this math learning exercise, students choose 20 items from a shopping list that includes the price of each food. Students estimate the cost of the list and then figure out the actual cost.
Curated OER
Family Activity: Adding and Subtracting Decimals
In this math worksheet, students work at home with a family member to add and subtract decimals in a sample check register. Students add deposits, subtract withdrawals and determine the balance of the account.
Curated OER
Double Your Money
What a creative way to delve into adding large numbers! After listening to a story called The King's Chessboard, learners estimate how much money they would have each day following instructions based on doubling and exponentially...
Pennsylvania Department of Education
Adding Common Fractions
Fourth graders estimate various measurements. In this lesson on measurement, 4th graders estimate the length and mass of multiple objects. Students discuss the difference between a guess and a reasonable estimate and discuss using...
Curated OER
Estimating With Fractions
Students explore fractions. In this fraction lesson, students estimate fractions and estimate sums of fractions. Students work with technology to develop math fluency.
Curated OER
Vocabulary: Addition Terminology
In this addition terminology worksheet, students complete many activities where they define and match addition terminology. Students complete 11 pages of activities.
Curated OER
Book Title: You Can’t Buy a Dinosaur with a Dime
Learners explore the concepts of multiple digit addition and subtraction. In this addition and subtraction lesson plan, students read the book You Can’t Buy a Dinosaur with a Dime and then discuss methods for solving a particular...
Curated OER
Dinosaur Math
Students read How to Train with a T.Rex and Win 8 Gold Medals and solve math problems. In this dinosaur math instructional activity, students write a math story to go with the dinosaur story. Students discuss the needed...
Curated OER
Decimals: Collaborative Lesson
Pupils explore mathematics by participating in a group activity. In this number value lesson, students identify the uses for decimals and how to best estimate whole numbers based on decimals and fractions. Pupils collaborate with...
McGraw Hill
Glencoe: Self Check Quizzes 1 Estimating Fraction Sums and Differences
Use Glencoe's randomly generated self-checking quiz to test your knowledge of estimating sums and differences. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the...
Calculator Soup
Calculator Soup: Estimating Sums and Differences of Fractions Calculator
Estimate sums and differences for positive proper fractions, n/d (numerator/denominator). Use rounding to estimate answers when adding or subtracting proper fractions.