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
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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).

  • adding multiples of 10 with representations, (Grade 1, Unit 11).

  • 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)