Common Core math · 1st grade
Understand two-digit numbers as tens and ones.
1.NBT.B.2 is part of the Common Core State Standards for Mathematics. Tens Builder practices it. Standards vary by state, so check with your kid’s teacher for the exact match.
Tens Builder: At a building site, kids build numbers with tens rods and ones cubes, then read numbers the blocks show. It starts with numbers to 20 and goes to 100. A miss labels the blocks and says to count the tens first, then the ones.