Big idea
Every digit has a job
In a two-digit number like 47, the LEFT digit counts TENS and the RIGHT digit counts ONES. 47 = 4 tens and 7 ones.
Two-digit numbers are bundles of tens with leftover ones.
Big idea
In a two-digit number like 47, the LEFT digit counts TENS and the RIGHT digit counts ONES. 47 = 4 tens and 7 ones.