Grade 1 Math · Level 3, Place Value to 120
Understand Decade Numbers
How the lesson starts: Understand Decade Numbers
The treehouse
Hi there! Max is building a treehouse. Max ties his sticks in bundles. Each bundle has 10 sticks. Let's count bundles with Max!
Match the tens
Tens have a neat trick. 2 tens is 20. 5 tens is 50. 9 tens is 90. The number of tens is the first digit!
Match 6 tens
Match 6 tens. Count by tens. 10, 20, 30, 40, 50, 60. 6 tens matches 60! Watch out! Not 6, and not 16. Six bundles is a lot of sticks!