Curated OER
Finding Missing Sums and Addends
In this sums/addends learning exercise, students find missing sums and addends in a set of 20 problems. Problems add 1 and 2-digit numbers. Answers included on page 2.
Curated OER
Addition Practice
In this addition worksheet, learners practice their adding skills. Students are given twenty addition problems with missing sums or addends where learners are to find the missing numbers.
Curated OER
Addition: Missing Sums and Addends
In this addition worksheet, students fill in missing sums and addends in a set of 20 problems. Some problems involve regrouping, answers are included on page 2.
Curated OER
Missing Number
First graders examine how to use a symbol and shape variable to represent a missing value in a mathematical equation. They listen to the book "Fish Eyes" and "One Less Fish," and observe the teacher write an equation represented for each...
Curated OER
Find Missing Sums and Addends-No Regrouping
In this addition worksheet, learners find missing sums and addends in a set of 20 problems without regrouping. Answers are included on page 2.
Curated OER
Addition Properties
Addition becomes much simpler once scholars understand its properties. They examine the commutative property through five equation pairs. For each, the addends have been switched and scholars must fill one in. The next six problems give...
Curated OER
Missing Sums and Addends
In this recognizing two-digit addition facts worksheet, students use a number line and addition facts to find the missing sums or addends in problems with and without regrouping. Students solve 20 problems.
Curated OER
Missing Sums and Addends
In this missing addends worksheet, students fill in the missing sums and addends in the addition questions. Students solve 20 problems.
Curated OER
Missing Addends
Where are all the addends? Addition novices solve 36 equations by filling in the single-digit addend to achieve the given sum. They reference several examples, each of which include object sets to help learners visualize the concept....
Curated OER
Addition: Number Bonds to 10
You have the answer and a variable, but something is missing! The class fills in the missing addend in 23 practice problems that all add up to 10. This is a great way to build number sense, pattern recognition, and automaticity.
Illustrative Mathematics
Find the Missing Number
First graders are asked to find the missing numbers in subtraction and addition equations. Each missing number is represented with a box and appears as an addend, subtrahend, sum, or difference.
Curated OER
Missing Sums and Addends
In this missing addends worksheet, students fill in the missing sums and addends for the addition questions. Students solve 20 problems.
Curated OER
Missing Sums and Addends
In this missing addends worksheet, learners fill in the missing sums and addends for the addition questions. Students solve 20 problems.
Curated OER
Review of Addition Facts
In this addition learning exercise, 1st graders write down the addends that make up 5 and 6. They match addition problems to the sums 5 and 6, and find the missing addends in 10 problems. They compare equations to 5 and 6 using the...
CK-12 Foundation
Addition and Subtraction of Polynomials: Sliders
Slide the coefficients to determine sums of polynomials. The interactive contains sliders to change the coefficients of an addend in a polynomial addition problem. Pupils determine the coefficients of the addend to arrive at particular...
CK-12 Foundation
Decimal Addition: Adding Little Pieces
A five-question interactive test scholars' knowledge of adding and subtracting decimals. A tool aids in problem-solving with movable parts that reveal addends and sums. Question types include one discussion, fill and in the blank, and...
Curated OER
Find the Missing Number
Kids can use the train themed number line to help them solve any of the 12 missing addend math problems. They must determine what plus the given number equals the provided answer.
Curated OER
Unknown Numbers in Sums and Differences - Step-by-Step Lesson
First grade mathematicians will love to monkey around with an illustrated word problem involving missing bananas. They must decide how many bananas the monkey ate by counting the remaining bananas and by counting the number Lee had and...
Curated OER
What's Missing?
Add a challenge for your young mathematicians' adventures in double-digit addition. Instead of simply computing sums in the 9 problems, they work backwards to fill in blanks among the addends. Resource makes a terrific extension or...
Curated OER
Addition: Missing Addends Tens and Ones
In this missing addend worksheet, students fill in missing addends to arrive at given sums. All numbers are 2-digits. A reference web site is given for additional activities.
Curated OER
Study Buddies: Working With Addition Properties
In this math worksheet, students will work with a coach to learn about and practice three addition properties: associative, commutative, and identity. Students will follow a step-by-step process and notes are provided for the coach.
Curated OER
Addends with Spiffy
Young scholars solve single variable equations. In this missing addend lesson, students solve problems with missing addends. Young scholars create a function box to help study numerical reasoning.
Curated OER
Add and Subtract within 20
Here is a more interesting way to practice addition and subtraction number sentences. Learners complete two sum boxes, adding across and down then totaling for a final sum. They do the same with subtraction in two more boxes. Finally,...
Curated OER
Addition - What Are the Missing Numbers?
In this addition worksheet, students determine what the missing numbers are in 8 two digit addition problems; either finding the sum or an addend. They estimate and calculate each answer in 4 three and four digit addition problems.