Grade level: 4 – 5th
Skills: Place value (large number)
Related environmental issues: Environmental Events
Area level: National
Arbor Day is an annual observance that encourages individuals and groups to plant trees and care for them. Arbor Day was first observed in in Nebraska in 1872. More than one million trees were planted on the first Arbor Day.
- Write one million in numbers.
- How many thousands make one million?
Source: Arbor Day Foundation
- one thousand thousands