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1st grade math · Unit 1: Adding and subtracting within 20

Read the story first

What this lesson shows

Fixes a mistake

A story with 5 and 3 can take away. What happens decides: 5 − 3, not 8.

The worked example

The lesson works this one step by step: 5 apples, give 3 away. Then your kid tries one like it on paper.

The steps

  1. Read the story first
  2. Act it out
  3. Then plus or minus

Helping at home

Read the story aloud and ask what happens: do things come or go? Act it out with drawings or objects before writing plus or minus.

If your kid gets stuck

Do things come or go?

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 1.OA.A.1
    Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
Matches a standard in all 50 states and DCSee each state's code

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