Maryland Math 1.NOS.A.1

1.NOS.A.1 is a cluster heading. These are the individual standards under it.

• 1.NOS.A.1.a

  Count forward and backwards by ones starting with any number.

• 1.NOS.A.1.b

  Skip count forward and backwards by tens.

01

What Students Need to Do

Students count forward and backward by ones from any starting number within 120. They also count forward and backward by tens without going past 120.

02

What Mastery Looks Like

Starting at 98, a student can say 99, 100, 101 and then count backward from 98 to 97, 96, 95. Starting at 46, they can count by tens to 56, 66, 76 and back to 36, 26, 16.

03

Common Misconceptions

Students may say 101 after 109 instead of 110, or say 90 after 100 when counting backward by ones. When counting by tens from 46, they may jump to 50 instead of 56.

04

How to Assess It

On an exit ticket, write: “Start at 98. Write the next four numbers and the previous four numbers. Start at 67. Do the same by tens.”

1. 01

   Give pairs a 120 chart and a counter; start at 99, move forward four spaces, then back six, saying each number.

2. 02

   Ask, “What changes when we count 47, 57, 67, then 57, 47? What stays the same?”

3. 03

   Play a partner countdown: start at 96 and alternate saying numbers ten less until 6, then count forward by tens.

4. 04

   Set out twelve pretend $10 bills; count savings by tens as bills go into a jar, then backward as they come out.

• 2.NOS.A.2

  Count forward and backward within 1000 starting with any number.