Maryland Math 2.NOS.A.2.a

Math2nd GradeNumber and Operation Sense

The Standard

Skip-count forward and backwards by 2s, 5s, 10s, and 100s.

Maryland College and Career Ready Standards for Mathematics (2025) · UNDERSTAND PLACE VALUE AND REPRESENTATIONS OF NUMBERS.

Teacher's field guide

What Students Need to Do: Students count forward and backward by 2, 5, 10, or 100 from a given number. They say or write each number in the pattern.
What Mastery Looks Like: Starting at 452, a student can count by hundreds to 552 and 652, or back to 352 and 252. They can keep patterns going by twos, fives, and tens without starting over at zero.
Common Misconceptions: Some students think counting by fives must start at 5 or land on a number ending in 0 or 5. Others subtract 10 instead of 100 when counting backward, or lose the pattern when they cross a ten.
How to Assess It: Exit ticket: Start at 452. Write the next two numbers and the previous two numbers when counting by 2s, 5s, 10s, and 100s.

Lesson moves

Build 345 with base-ten blocks, add or remove 2, 5, 10, or 100 three times, and record each number.
Ask: Starting at 452, why does counting by fives give 457, then 462?
Put 452 on the board, draw a card marked 2, 5, 10, or 100, and race to name two numbers in each direction.
Draw four boxes labeled 100 pencils each; count the stock up as boxes arrive and down as boxes ship.

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