Grade 1: Unit 1.NBT.C.4-6, Use place value understanding and properties of operations to add and subtract

Lesson Seed: Using My Hundred Chart (Lesson seeds are ideas for the domain/cluster/standard that can be used to build a lesson.

Lesson Seeds are not meant to be all-inclusive, nor are they substitutes for instruction.)

Domain: Number and Operations Base Ten
Cluster:Use place-value understanding and properties of addition to add and subtract.
Standard(s):1.NBT.C.5- Given a two-digit number to mentally find 10 more or 10 less without having to count. Explain the reasoning used.
Purpose/Big Idea:
  • For students to strengthen and reinforce their understanding of number patterns on the hundreds chart and use them to find 10 more or 10 less than a given number.

Materials:
  • Resource Sheet 1: Hundred Chart
  • Base Ten Manipulatives
  • Clear counters
  • White boards
  • Markers

Activity:
  • Give pairs of students 2 or more numbers to build using base ten manipulatives. The numbers should be in the same column on the Hundred Chart. (Use connecting cubes to help students see that 10 ones make a 10 if needed.)
  • Students then find the numbers they made on the Hundred Chart.
  • Have students think about how the numbers they made are alike and different. Students then discuss what they noticed with their partner.
  • Students then check to see if what the pattern applies to numbers in other columns. Give each student a clear counter to put at the beginning of any column. They then select 2 or more numbers within the column and mark them with additional clear counters. Next, students build or draw the numbers they selected. With their partner, they check to see if the patterns they noticed still apply.
  • Have students share out the patterns they noticedabout numbers in the same column. Students can show their models or drawings (on white boards) to the class to add to their justification.

Guiding Questions:
  • How are the numbers you made alike and different?
  • What do you notice about the place value in the numbers you built within each column?
  • What patterns did you notice/find while building numbers?
  • How do you find a number that is 10 more? How do you find a number that is 10 less?

July 14, 2013 Page 1 of 2