Which place decides?
Compare using the greatest differing place, including equality.
Explore this lesson →8 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Align matching places and compare from the greatest place toward the ones.
- The first unequal place decides which whole number is greater. All smaller places together cannot reverse that decision.
- Different digit lengths can be compared with zero counts in the unoccupied greater places.
- If every place agrees, the amounts are equal, even when their written forms differ.
Something to notice
Ask the learner to name the deciding place before reading the smaller places. Discuss why many large lower digits cannot overturn a larger unit. Include two forms of the same amount and ask why no differing place exists. Correct symbols and place choices are practice; invite a spoken or drawn justification.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 4 · 4.NBT · US Common Core
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.