Mississippi Math 2.NBT.2

Math2nd GradeNumber and Operations in Base Ten (NBT) Understand Place Value

The Standard

Count within 1000; skip-count by 5s starting at any number ending in 5 or 0. Skip-count by 10s and 100s starting at any number.

2025 Mississippi College- and Career-Readiness Standards for Mathematics · Work with Equal Groups of Objects to Gain Foundations for Multiplication

Teacher's field guide

What Students Need to Do: Students say and write the next numbers in a sequence, even when they cross a ten or hundred. They add 5 to numbers ending in 0 or 5, and add 10 or 100 from any starting number.
What Mastery Looks Like: A student counts 398, 399, 400, 401 without stopping. They count from 395 by 5s to 400, 405, 410, and from 397 by 10s to 407, 417, 427. They count from 348 by 100s to 448, 548, 648.
Common Misconceptions: Some students think counting by 10s must start at a number ending in 0, so they stop at 397. Others go from 395 straight to 405 when counting by 5s, or write 458 after 348 when adding 100.
How to Assess It: Exit ticket: Write the next three numbers when counting by ones from 398, by 5s from 235, by 10s from 396, and by 100s from 348.

Lesson moves

Have students build 386 with base-ten blocks, add one ten rod at a time, and write each new number.
Ask, “Why do 397, 407, and 417 all end in 7?” Have students draw a place-value sketch to explain.
Give pairs a number path starting at 475; partners take turns filling in the next number by 5s until 525.
Start a pretend step counter at 143; have students record the total after each of four 100-step walks.

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