Exploring Hundred Multiples

Subject

Mathematics

Learning Objective

By the end of this 90-minute lesson, students will be able to read, write, and represent multiples of 100 up to 1,000 using base-ten numerals, number names, and expanded form.

Learning Standards

• 2.NBT.A.1.a: Understand that 100 can be thought of as a bundle of ten tens — called a "hundred."
• 2.NBT.A.1.b: Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones.
• 2.NBT.A.2: Count within 1000; skip-count by 5s, 10s, and 100s.

Key Vocabulary

• Multiple
• Hundreds
• Tens
• Ones
• Expanded form
• Skip-counting
• Numerals

---

Hook (Launch, Warm-Up) — 10 minutes

Activity: Hundred Club Chant

• Gather students in a circle. Introduce the “Hundred Club” and explain the focus on the number 100.
• Lead them in a chant skipping by 100: 100, 200, 300, ... up to 1,000, clapping on each number to reinforce rhythm and skip-counting aloud.
• Use a big, colorful hundreds chart to visually follow along as you chant.

Purpose: Activate prior knowledge of counting and introduce skip counting by 100s.

---

Learn (Explore)

Mini-lesson (I Do) — 15 minutes

Teacher Models:

• Write the number 100 on the board. Break it down as 1 hundred, 0 tens, and 0 ones.
• Use base-ten blocks to illustrate: One “flat” representing 100, zero rods (tens), zero units (ones).
• Write 100 in expanded form: 100 + 0 + 0. Repeat for 200, 300, up to 1,000.
• Show how to write each number in words: “One hundred,” “Two hundred,” etc.
• Demonstrate on a whiteboard how these relate to skip counting by hundreds on the hundreds chart.

Purpose: Establish clear understanding of place value in the hundreds and connection to multiples.

Guided Practice (We Do) — 20 minutes

Activity: Build and Represent

• Students work in pairs with base-ten blocks and place value mats.
• Call out multiples of 100 (e.g., 400, 700). Each pair builds the number using the blocks, writes the number in digits, writes the number in words, and shows the expanded form on a worksheet.
• Circulate, asking each pair to explain their number representation aloud.

Purpose: Engage students actively in constructing and verbalizing multiples of 100.

---

Independent Practice (You Do) — 25 minutes

Task: Hundreds Hunt

• Each student receives a 'Hundreds Hunt' worksheet with:
  • A blank number chart from 100 to 1,000.
  • Spaces to write skip-count numbers, expanded form, and words for selected multiples of 100.
• Students complete the worksheet silently, referring back to charts and base-ten blocks as needed.

Purpose: Provide individual practice consolidating learning.

---

Closing (Synthesis, Discuss) — 10 minutes

• Regroup as a class. Invite several students to share their favorite multiple of 100 and explain how they built it.
• Review the connection between numbers, words, and expanded forms one more time.
• Quick verbal quiz: “What is 600 in words? How many hundreds are in 800?”
• Highlight how understanding hundreds makes counting bigger numbers easier.

---

Fluency Focus

• Daily skip-counting by hundreds orally. Use clapping or tapping to build rhythm and memory.
• Practice recognizing and writing multiples of 100 through interactive games or flashcards.

---

Differentiation

• For advanced learners: Challenge with skip-counting beyond 1,000 or writing expanded form of 3-digit multiples including non-zero tens (e.g., 120, 340).
• For learners needing scaffolding: Provide pre-printed number cards labeled with ones, tens, and hundreds for sorting. Use partner support and step-by-step base-ten block guidance.
• Use visual aids such as number lines and hundreds charts.

---

Assessment

Exit Ticket:

• Each student writes down three different multiples of 100 chosen by the teacher.
• Write each number in digits, words, and expanded form.
• Teacher collects and reviews to assess mastery.

Misconception Alert:

• Some students may confuse multiples of 100 with simply numbers ending in double zeros that don’t represent proper place value (e.g., thinking 1,020 is a multiple of 100 rather than 1,000 or 100). Emphasize place value and skip counting to clarify.

---

This lesson integrates hands-on manipulatives, visual and auditory learning, and writing practice—all targeted to solidify understanding of hundreds according to Common Core standards for Grade 2 Number and Operations in Base Ten.