Math Games:
You can sort through these always-free math games by grade level, or by skill you're looking to work on. There are also free worksheets you can print out.
https://www.mathgames.com/kindergarten
PBS kids Math Games:
Fun math driven games for Kindergarteners.
https://pbskids.org/games/math/
Splash Learn:
Splash learn has math learning activities that are fun to play and cover common core standards.
https://www.splashlearn.com/math-games-for-kindergarteners
Bedtime Math:
Bedtime Math’s mission is to introduce math as a fun part of children’s daily routine, as common and beloved as the bedtime story. Bedtime Math provides free apps, books and printable activity pages. The platform is targeted toward children age 2 through elementary school.
http://bedtimemath.org/fun-math-at-home/
Cool Math 4 kids:
Coolmath4kids is for kids from kindergarten to sixth grade. Kids can work on addition, subtraction, multiplication, division and fractions through online math games, quizzes, manipulatives and more
https://www.coolmath4kids.com/
Youtube Videos:
Subatize fast! https://www.youtube.com/watch?v=cI37YqVVQc0
Counting:
To 50 and backwards:
https://www.youtube.com/watch?v=YtNskltyA0E
To 100:
https://www.youtube.com/watch?v=cVwjmC-gpBU
https://www.youtube.com/watch?v=VHwlKl5SsHc
https://www.youtube.com/watch?v=Fr6SI1qwBPs
https://www.youtube.com/watch?v=1dkPouLWCyc
https://www.youtube.com/watch?v=MiUw36s9V_g
Backwards from 100!
https://www.youtube.com/watch?v=8jMmZaFvRpE
To 120:
https://www.youtube.com/watch?v=EzzQ8x-9HTo
https://www.youtube.com/watch?v=f6NfQM1LIGc
By 5's:
https://www.youtube.com/watch?v=r176jXYwct8
https://www.youtube.com/watch?v=oWNOLHG49EY
https://www.youtube.com/watch?v=KKg0eu9_fsM
https://www.youtube.com/watch?v=EemjeA2Djjw
https://www.youtube.com/watch?v=amxVL9KUmq8&t=51s
https://www.youtube.com/watch?v=Sh8YmvJuJ8A
https://www.youtube.com/watch?v=fswDerG4Jms
By 10's:
https://www.youtube.com/watch?v=_yr-IuM4SEA
https://www.youtube.com/watch?v=W8CEOlAOGas
https://www.youtube.com/watch?v=EFP6JwOWrlg
https://www.youtube.com/watch?v=7stosHbZZZg
https://www.youtube.com/watch?v=uYRTtwZGwj8
https://www.youtube.com/watch?v=yQSdKlNvrmw
https://www.youtube.com/watch?v=Rd5DBkP9avw
By 2's:
https://www.youtube.com/watch?v=MPda14jMNSA
https://www.youtube.com/watch?v=G2iStjfHxrk
https://www.youtube.com/watch?v=GvTcpfSnOMQ
https://www.youtube.com/watch?v=8wwydguSKOU
https://www.youtube.com/watch?v=OCxvNtrcDIs
https://www.youtube.com/watch?v=GvTcpfSnOMQ&t=24s
https://www.youtube.com/watch?v=8wwydguSKOU&t=21s
https://www.youtube.com/watch?v=G2iStjfHxrk&t=8s
https://www.youtube.com/watch?v=jnGJjnhakFY
https://www.youtube.com/watch?v=wMfAtlz-WJE
Addition:
When you add with a Pirate
https://www.youtube.com/watch?v=WT_wvvEvkw4
Addition song:
https://www.youtube.com/watch?v=exsFIpQVNIw
Addition Facts:
https://www.youtube.com/watch?v=X3hEMk9W68A
Number pairs 10:
https://www.youtube.com/watch?v=ch7KzI3n2Zk
Subtraction:
When you subtract with a Pirate
https://www.youtube.com/watch?v=QkPa9V2wtZs