Lesson: Doubles Minus One Mathematics • 1st Grade

Start Practising

In this lesson, we will learn how to add two consecutive numbers with sums up to 20 by finding one less than a doubles fact.

Lesson Plan

Students will be able to

  • use models to solve addition problems by using the doubles minus one strategy,
  • solve addition problems by using the doubles minus one strategy without using models,
  • recognize situations in which doubles minus one is a reasonable strategy for solving addition problems,
  • solve word problems using the doubles minus one strategy.

Lesson Playlist

  • Finding One Less Than a Known Double as a Strategy to Add
    00:28
  • Finding One Less Than a Known Double as a Strategy to Add
    01:39
  • Finding One Less Than a Known Double as a Strategy to Add
    02:04

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