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
The Case of the Missing Numbers
In this finding the unknown numbers instructional activity, students help Detective Digit solve addition and subtraction problems, match the answers with letters, and find the name of the number thief. Students solve and match 16 problems.
Curated OER
Addition: Missing Numbers 2
In this addition practice worksheet, students use the counting blocks to help them solve 12 math problems. It requires that they find the missing number to complete each of the addition sentences.
Curated OER
Addition: Missing Numbers 3
A continuation of a previous worksheet, learners must complete this set of addition problems by filling in the blank. They are required to find a number that makes each of the 12 addition equations true.
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
Missing Numbers in Two Digit Addition Worksheet #9
In this addition worksheet, students solve 20 problems in which missing numbers in two digit addition problems are filled in. There is no regrouping on the page.
Curated OER
Fill in the Missing Numbers
In this addition worksheet, students fill in the missing number in 5 addition problems involving 3 single and double-digit numbers. Students write their answers in the boxes provided.
Curated OER
Who Wants to Win Millions?
Addition practice awaits your students in this engaging Jeopardy-style game. The students can earn hundreds of dollars by answering questions correctly. The categories include: Adding Doubles, Add and Find Missing Numbers, Adding 3...
Illustrative Mathematics
What’s Missing?
Now you see them, now you don't! This fun peek-a-boo activity engages young mathematicians in developing their ability to compose and decompose numbers. After being presented with a series of counters, children close their eyes while the...
DK Publishing
Addition, Multiplication, and Division
These equations are missing numbers, and scholars must process multiple operations to complete them. There are addition, multiplication, and division problems here, each missing an addend, divisor, or factor. After completing 24 of these...
Curated OER
What's That Number? 1-Digit Addition and Subtraction
In this subtraction and addition worksheet, students fill in missing numbers in problems necessary to arrive at given answers. All problems use 1-digit numbers only.
Curated OER
Make 19
In this addition worksheet, 3rd graders figure out and put in the missing numbers in 8 addition problems, so each of the sums in the boxes add up to 19. Students write down all the pairs of numbers with a total of 19 and solve 5...
University of Texas
Complex Numbers
Are complex numbers and binomials similar? This stack of slides provides an introduction to complex numbers and shows how to operate with them. The worked examples show a connection between operating with binomials and operating with...
DK Publishing
Subtracting Big Numbers, part 2
Get some subtraction practice with a multi-faceted math worksheet. After reviewing two sample subtraction problems at the top of the page, third graders solve for the differences of vertical problems, horizontal problems, and word...
Curated OER
Missing Numbers Addition
In this addition and subtraction practice worksheet, students solve 24 problems that require them to write the missing numbers in the addition sentences.
Curated OER
Missing Numbers Addition (E)
In this addition and subtraction practice worksheet, students solve 24 problems that require them to write the missing numbers in the addition sentences.
Curated OER
Missing Numbers Subtraction (C)
In this addition and subtraction practice activity, students solve 24 problems that require them to write the missing numbers in the subtraction sentences.
Curated OER
Number Bonds to 10: Game
Knowing number bonds that make 10 is a good way to build number sense and can help in solving basic addition and subtraction problems. Kids review number bonds, then play a game where they are given a number and try to shout out the...
Curated OER
Pattern Puzzles
A short video introduces place value in addition and subtraction. As a class, your students identify all even numbers up to one hundred and explain the pattern. They use addition strategies to fill in the missing numbers on the number grid.
Curated OER
Addition: Missing Numbers with 3 Addends
In this 3 addend addition practice instructional activity, students use their problem solving skills to solve 20 problems that require them to fill in the missing numbers in the problems.
Curated OER
Missing Numbers Addition (A)
In this math worksheet, students solve 40 math problems in which there is a missing addend. Students fill in the missing number which makes the addition sentence correct.
![Easter Bunny Feeding Time: Missing Digits [C] Worksheet](http://content.lessonplanet.com/resources/thumbnails/218006/large/nziyntm4lmpwzw.jpg?1414307703 "Easter Bunny Feeding Time: Missing Digits [C] Worksheet")
Curated OER
Easter Bunny Feeding Time: Missing Digits [C]
In this missing numbers worksheet, students fill in missing digits in addition, subtraction and multiplication problems. Answers included on page 2.
![Easter Bunny Feeding Time: Missing Digits [D] Worksheet](http://content.lessonplanet.com/resources/thumbnails/218009/large/nziyntqzlmpwzw.jpg?1414307979 "Easter Bunny Feeding Time: Missing Digits [D] Worksheet")
Curated OER
Easter Bunny Feeding Time: Missing Digits [D]
In this missing numbers worksheet, students fill in missing digits in addition, subtraction and multiplication problems. Answers included on page 2.
Curated OER
Addition Squares
In this addition activity, 1st graders add together all the numbers going across and down 8 cubes. Students add any missing numbers in order for each addition math problem to be the same sum going across and down.