Place value
Comparing 3-digit numbers
Addition and subtraction within 100
Repeated addition: haircuts
Understanding place value when adding tens
Understanding place value when adding ones
Subtracting 1 vs. subtracting 10
Subtracting 1s using place value
Subtracting 10s using place value
Intro to addition with 2-digit numbers
Adding 2-digit numbers without regrouping 1
Adding 2-digit numbers without regrouping 2
Breaking apart 2-digit addition problems
Regrouping to add 1-digit number
Adding by making a group of 10
Intro to subtraction with 2-digit numbers
Subtracting 2-digit numbers without regrouping 1
Subtracting two-digit numbers without regrouping (example 2)
Subtracting a 1-digit number with regrouping
Adding 53+17 by making a group of 10
Adding by making a group of 10
Strategies for adding 2-digit numbers
Addition and subtraction with number lines
Strategies for adding and subtracting within 100
Adding 2-digit numbers without regrouping 2
Subtracting 2-digit numbers without regrouping 1
Subtracting with regrouping (borrowing)
Adding and subtracting on number line word problems
Subtraction word problem: tennis balls
Addition word problem: horses
Subtraction word problem: basketball
Addition word problem: spots
Word problems with “more” and “fewer” (within 100)
Missing numbers in addition and subtraction
Addition and subtraction missing value problems
Adding 3-digit numbers (no regrouping)
Addition and subtraction within 1000
Subtracting 1s, 10s, and 100s
Subtracting 3-digit numbers (no regrouping)
Subtracting 1s, 10s, and 100s
Subtracting 1, 10, or 100
Estimating adding and subtracting 3-digit numbers
Breaking apart 3-digit addition problems
Solving 3-digit addition in your head
Addition using groups of 10 and 100
Adding and subtracting on number line
Strategies for adding 2- and 3-digit numbers
Measuring lengths with different units
Comparing and estimating length
Measurement, data, and geometry
Measuring length: golden statue
Making picture graphs and line plots
Reading bar graphs: bikes
Making picture graphs and line plots
Telling time (labeled clock)
Telling time (unlabeled clock)
Cousin Fal’s shape collection
Equal parts of circles and rectangles
Sign In 
