Lesson plan

7. Using place value to find ten less (A)

teaches Common Core State Standards CCSS.Math.Content.1.NBT.C.5 http://corestandards.org/Math/Content/1/NBT/C/5
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

You have saved this lesson plan!

Here's where you can access your saved items.

Dismiss

Lesson objective: Apply an understanding of place value to explain how a number changes when ten is taken away.

This lesson provides an opportunity for students to apply their knowledge and understanding of place value to a mathematical situation. Students are asked to use examples to explain why all numbers do not end in zero after ten is taken away.

Key Concept students will use:

• We can find ten more or ten less without having to count.

Skills students will use:

• their understanding of place value (Grade 1, Unit 8).

• mental mathematics to find 10 more without needing to count (Grade 1, Unit 11).

Students engage in Mathematical Practice 7 (Look For and Make Use of Structure) as they notice how taking away 10 will change the tens place (by one ten) but not change the ones place.

Key vocabulary:

• one
• ones place
• subtract
• take away
• ten
• tens place

Special materials needed:

• base ten blocks (optional)
• hundred chart (optional)