Maryland Math 1.NOS.A.1.b

Math1st GradeNumber and Operation Sense

The Standard

Skip count forward and backwards by tens.

Maryland College and Career Ready Standards for Mathematics (2025) · EXTEND THE COUNT SEQUENCE.

Teacher's field guide

What Students Need to Do: Students count aloud by tens, both forward and backward. They start at a given multiple of ten and find the next number without starting over at 10.
What Mastery Looks Like: A student can start at 60 and say 70, 80, 90, then count back through 50, 40, 30. They can fill in a missing number and explain that each step adds or takes away one ten.
Common Misconceptions: Some students count by ones when asked to count backward. Others say the tens in the wrong order, such as 50, 60, 80, or think counting back from 80 means saying 79.
How to Assess It: On an exit ticket, have students fill in 30, 40, __, __, 70 and 90, 80, __, __, 50. Ask them to read both sequences aloud.

Lesson moves

Give pairs ten bundles of ten craft sticks to add one bundle at a time, then remove them while counting aloud.
Show 80, 70, 60 on the board and ask, "What changes each time, and what number comes next?"
Give pairs cards labeled 10 through 100 to arrange and read forward, then backward.
Put ten dimes on a desk and have students count the cents as you add and remove one dime.

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