If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Unit: Addition and subtraction

0

Possible mastery points

Relate addition and subtraction

Learn
Relating addition and subtraction
(Opens a modal)
Practice
Relate addition and subtractionGet 5 of 7 questions to level up!

Addition within 20

Learn
Adding within 20 using ten frames
(Opens a modal)
Adding within 20 using place value blocks
(Opens a modal)
Adding 7 + 6
(Opens a modal)
Adding 8 + 7
(Opens a modal)
Adding 5 + 3 + 6
(Opens a modal)
Practice
Add within 20 visuallyGet 5 of 7 questions to level up!
Add within 20Get 5 of 7 questions to level up!
Add 3 numbersGet 5 of 7 questions to level up!

Subtraction within 20

Learn
Subtract within 20 using a number line
(Opens a modal)
Subtract within 20 using place value blocks
(Opens a modal)
Subtract within 20 using ten frames
(Opens a modal)
Subtracting 14 - 6
(Opens a modal)
Practice
Subtract within 20 visuallyGet 5 of 7 questions to level up!
Subtract within 20Get 5 of 7 questions to level up!

Add using arrays

Learn
Adding with arrays
(Opens a modal)
Using arrays in word problems
(Opens a modal)
Repeated addition: haircuts
(Opens a modal)
Practice
Adding with arraysGet 3 of 4 questions to level up!
Array word problemsGet 3 of 4 questions to level up!

Add and subtract within 20

Learn
Adding within 20 using place value blocks
(Opens a modal)
Adding within 20 using ten frames
(Opens a modal)
Subtract within 20 using place value blocks
(Opens a modal)
Subtract within 20 using a number line
(Opens a modal)
Practice
Add & subtract within 20Get 5 of 7 questions to level up!

Equal sign

Learn
Equal sign
(Opens a modal)
Practice
Equal signGet 5 of 7 questions to level up!

Quiz 1

Level up on the above skills and collect up to 1000 Mastery points

Missing number within 20

Learn
No videos or articles available in this lesson
Practice
Find missing number (add and subtract within 20)Get 5 of 7 questions to level up!

Word problems within 20

Learn
Addition and subtraction word problems: superheroes
(Opens a modal)
Addition and subtraction word problems: gorillas
(Opens a modal)
Practice
Addition and subtraction word problems 1Get 5 of 7 questions to level up!
Addition and subtraction word problems 2Get 5 of 7 questions to level up!
Add and subtract within 20 word problemsGet 5 of 7 questions to level up!

Word problems with "more" and "fewer"

Learn
Comparison word problems: marbles
(Opens a modal)
Comparison word problems: roly-polies
(Opens a modal)
Practice
Add and subtract within 20 word problemsGet 5 of 7 questions to level up!
Word problems with "more" and "fewer" 2Get 5 of 7 questions to level up!

Quiz 2

Level up on the above skills and collect up to 600 Mastery points
Up next for you:

Unit test

Level up on all the skills in this unit and collect up to 1600 Mastery points!

About this unit

First, we will learn how addition and subtraction relate. Next, we will add and subtract numbers less than or equal to 20 and solve addition and subtraction word problems. Finally, we will begin adding 2-digit numbers.