Wyoming Math K.CC.1

K.CC.1 is a cluster heading. These are the individual standards under it.

• K.CC.1b

  Count backwards by ones from 20.

01

What Students Need to Do

Students say the numbers from 1 to 100 in order. They count by tens to 100 and count backward by ones from 20.

02

What Mastery Looks Like

A student counts to 100 without skipping or repeating numbers, including when moving from 29 to 30. They count 10, 20, 30 through 100 and count backward from 20 to 0 without help.

03

Common Misconceptions

Students may skip a number at a change of decade, such as going from 39 to 50. When counting backward, they may reverse only the first few numbers, then start counting forward again.

04

How to Assess It

Ask each student to count aloud to 100 by ones, to 100 by tens, and backward from 20 to 0. Note any skips, repeats, or places where they need help.

1. 01

   Build ten trains of ten linking cubes, touch each cube while counting to 100, then count the finished trains by tens.

2. 02

   Show 39 and 40 on a hundred chart and ask partners, 'What number comes after 39, and how do you know?'

3. 03

   Put a counter on 20 on a number path, roll a die, move backward that many spaces, and say each number aloud.

4. 04

   Count 100 classroom paper clips into ten cups, putting ten in each, and say the running total each time a cup fills.

• 1.NBT.1a

  Count forward and backward, starting at any number less than 120.