TEKS Math 2.7.B

Math2nd Grade

The Standard

use an understanding of place value to determine the number that is 10 or 100 more or less than a given number up to 1,200

Texas Essential Knowledge and Skills for Mathematics

Teacher's field guide

What Students Need to Do: Students use place value to change a number by one ten or one hundred. They track how the tens, hundreds, or thousands places change when crossing a place-value boundary.
What Mastery Looks Like: Students answer accurately, including when a change crosses into a new hundred or thousand. They can explain which place changed and why the other places stayed the same.
Common Misconceptions: Students may change the wrong digit or change every digit. They may also reverse more and less or miss place-value changes across boundaries, such as finding 10 more than 396.
How to Assess It: Give this exit ticket: “Start with 398. Write the numbers that are 10 more, 10 less, 100 more, and 100 less. Explain one answer.”

Lesson moves

Build 486 with base-ten blocks, add or remove one ten or hundred, then record each new number.
Ask students to explain why 10 more than 795 is 805 instead of 705.
Play a card game where students draw a number, spin 10 or 100 more or less, and state the result.
Use a library count of 735 books, then find the new totals after receiving 100 books or removing 10 books.

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