Make a Ten Before Adding the Rest
Find the first addend’s partner to ten.
About 15 minutes, plus any extended practice
Open lesson 1Use Efficient Strategies Within Twenty
Use ten, doubles, friendly groupings, and related addition to calculate.
Before you begin
- Know addition facts within five; identify a full ten.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Use a Known Double for a Near Double
Double the smaller addend, then add the extra one.
About 15 minutes, plus any extended practice
Open lesson 2Group Three Addends into an Easier Sum
Find a pair of supplied addends that makes ten.
About 15 minutes, plus any extended practice
Open lesson 3Subtract in Two Parts Through Ten
Remove enough from the teen start to reach ten.
About 15 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- Common Core State Standards, mathematics: 1.OA.B.3 — Use ten, doubles, friendly groupings, and related addition to calculate.
- Common Core State Standards, mathematics: 1.OA.B.4 — Use ten, doubles, friendly groupings, and related addition to calculate.
- Common Core State Standards, mathematics: 1.OA.C.6 — Use ten, doubles, friendly groupings, and related addition to calculate.
These references informed the topic selection. They do not certify complete standards alignment.