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Kindergarten math · Unit 3: Sorting and counting

One rule at a time

What this lesson shows

Fixes a mistake

Big and little circles and triangles. Sort by shape or by size, not both at once, and each one fits in just one group.

The worked example

The lesson works this one step by step: 4 circles and 3 triangles, by shape. Then your kid tries one like it on paper.

The steps

  1. Pick one rule
  2. Put each one in a group
  3. Every one fits
  4. Count each group

Helping at home

Read each box aloud, with its rule. Your kid sorts by that one rule only, then counts each group. Sort socks by size one day and by color the next.

If your kid gets stuck

One rule only. Every shape goes in one group.

Watch it with Lux

With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.

See how Lux works

Standards

  • Common Core K.MD.B.3
    Classify objects into given categories; count the numbers of objects in each category and sort the categories by count.
Matches a standard in all 50 states and DCSee each state's code

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