Blog
Grades
Kindergarten
First grade
Second grade
Third grade
Fourth grade
Fifth grade
Subjects
Math
Science
Language Arts
Standards
Math (CCSS)
Science (NGSS)
Language Arts (CCSS)
Fact families: what’s behind my back?
Video
Easier quiz
Harder quiz
Printables
Worksheet
Unit map
Key takeaways
Standards addressed
CCSS.MATH.CONTENT.1.OA.B.4
Understand subtraction as an unknown-addend problem.
Share this video
Follow MightyOwl
More
1st
grade
Math
videos:
1st
Math
Comparing two digit numbers: hungry alligators
1st
Math
Math tricks - make a ten
1st
Math
Math tricks: doubles facts
1st
Math
Growing numbers in the Garden of Ten: whole groups of ten
1st
Math
Digging for data: tables, tallies, and charts
1st
Math
Building 10 by 10: adding within 20 using 10 frames
1st
Math
Got shapes? Not without attributes!
1st
Math
Tick-Tock, it’s twelve o’clock! From am to pm
1st
Math
Time flies when you’re having fun: telling time to the hour
1st
Math
Telling time to the half hour: analog and digital clocks
1st
Math
Shapes: the best building materials
1st
Math
Picture-perfect pictographs
1st
Math
Bar graphs under the sea
1st
Math
Different units, different answers: measuring length
1st
Math
To infinity and beyond! Comparing lengths in your room
1st
Math
Adding and subtracting 10
1st
Math
Adding without regrouping: place value blocks and rocks
1st
Math
Counting to 120: helping at the school store
1st
Math
Bonds, number bonds: find the missing number
1st
Math
Can’t catch me off balance: the equal sign
1st
Math
Addition and subtraction word problems: forest field trip
1st
Math
How to measure: mighty measurements
1st
Math
Place value fun with tens and ones
1st
Math
A baker’s ten: subtracting by groups of ten
1st
Math
Addition and subtraction on a number line
1st
Math
Adding with regrouping
1st
Math
Tidy tens: two-digit number represent amounts of tens and ones
1st
Math
Sharing is caring: addition and subtraction with counting
1st
Math
Dice game: properties of addition