• Extend the Counting Sequence

• MP7. Look for and make use of structure.

1. Number and Quantity

• Make use of the base-ten counting structure when using special words at the decades, like “sixty” and “seventy.” (MP7)

• When might someone want to count by tens instead of ones?

• Which numbers can be written with two numerals and which numbers are written with three?

• This expectation represents major work of the grade.

• In kindergarten, students count to 100 by ones and tens, count forward from a given number, and connect counting to cardinality.

• In Grade 1, this expectation connects with understanding place value and with adding and subtracting within 20.

• In Grade 2, students extend their place value understanding to hundreds and three-digit numbers, and use this along with the properties of operations to add and subtract within 1000 and fluently add and subtract within 100.