Lesson 29: Skip Counting by 10s and 100s
Lesson Objectives
- Skip count up and down by 10’s and 100’s using concrete objects and pictures
- Skip count up and down by 10’s and 100’s using numbers, number lines, and hundred charts
- Skip count using patterns
- Use arrays as a strategy for skip counting
Materials
- Extend Workbook (Page 29)
- Counters or manipulatives
- Various number lines (100s Chart, Thousand’s Chart by 50’s)
- Highlighters, markers, or crayons
- Base Ten Blocks or Linking Cubes
Step 1: Warm Up (5 min)
Take out a 100s chart. Review skip counting by 10’s. Then, start on the 10’s and skip every other number (10, 20, 30, 40, 50) until you get to 100. Highlight all multiples of 10 one color to visually see all multiples of 10 to 100. Explain skip counting by 100’s and that similarly to 10’s, you will just add a zero to the number (e.g. 20/200, 30/300, 40/400, and so forth until you get to 1,000. Provide numerous opportunities for students to experience counting by 10s with real objects (e.g. linking cubes, base 10 blocks, pom poms, pony beads – placing 10 at a time on pipe cleaners, q-tips, counters).
Step 2: Vocab Review (5 min)
Review prior vocabulary: repeated addition and skip counting. Skip counting is a tool that will help us find pairs of equal addends. It is also the foundation of multiplication. Tell students that they will be learning a process that will make it very easy for them to learn how to multiply. Remind them that they can count forward and backward, but that they can also skip numbers in sequence. When we skip count, we start on a number and skip every other number in sequence. Remind them of even numbers.
Step 3: Model (5 min)
Find a skip counting song (by 10’s) and remind students about the importance of skip counting. Review skip counting by 2’s and 5’s. Ask students to skip count backwards, after practicing forward (using number lines, as needed). Use language like “one group of 10” to help the concept of skip counting by 10s. Model skip counting forward and backward with multiples of 10. Repeat these steps with skip counting by 100, using your 1000s Chart by 50s).
Step 4: Guided Practice (5 min)
Distribute a 100s chart, and start on 10. Ask students to skip count by 10’s forward to 100. Have them circle each number with a red marker. Then, ask them to skip count by 10’s backwards until they get to 0. Ask students to write down multiples of 10 from their 100s Chart up to 100 on a separate sheet of paper. Distribute a 1,000s chart by 50’s, and start on 100. Ask students to skip count by 100’s forward to 1,000. Have them highlight each number with a yellow marker. Ask students to write down multiples of 1000 from their 1,000s Chart up to 1,000 on a separate sheet of paper.
Step 5: Student Practice (5 min)
Go to Student Workbook Page (29). Read the directions at the top of the page. Tell students they will be practicing skip counting forward and backward by 10’s and 100’s starting on different numbers. Remind students that they can use their 100s chart or 1000’s chart and multiples of 10 or 100 resource page that they created on the guided practice. Looking at the first sequence, ask students to skip count by 10’s from 80 to continue the sequence (once they get to 100, remind students that they continue to count from 10 but now within 100: 100, 110, 120). Finish the next 3 sequences, following the directions to skip forward or backward based on the directions.
Step 6: Wrap Up (5 min)
To wrap up the lesson, review the learning objectives and core vocabulary words again and ask your students about their experience.
