Repeated addition
Repeated addition: haircuts
Adding 1s and 10s
Adding 1 vs. adding 10
Understanding place value when adding tens
Understanding place value when adding ones
Subtracting 1s and 10s
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
Adding with regrouping
Addition within 100
Subtracting 2-digit numbers without regrouping 1
Subtracting with regrouping (borrowing)
Subtraction within 100
Adding and subtracting on number line word problems
Subtraction word problem: tennis balls
Addition word problem: horses
Word problems within 100
Subtraction word problem: basketball
Addition word problem: spots
Word problems with “more” and “fewer” (within 100)
Skip-counting by 5s
Counting by 10s
Skip-counting by 100s
Skip-counting
Missing numbers in addition and subtraction
Addition and subtraction missing value problems
Adding 1s, 10s, and 100s
Adding 10 or 100
Adding 1s, 10s, and 100s
Adding 3-digit numbers (no regrouping)
