In this lesson, students will explore how numbers change when we add or subtract 10 or 100. Using place value knowledge, they’ll see patterns and shortcuts for quickly finding a number that is more or less than another. Through hands-on strategies and visuals, students will build number sense and strengthen their mental math skills — without a calculator in sight! TEKS: 3.2C Determine numbers that are 10 or 100 more or less MCCRS: 3.NBT.A.1 The student is expected to use place value understanding to round whole numbers to the nearest 10 or 100.

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