Adding Big Numbers: No Trading!

Math Grades 1st Grade 2:39 Video
Print Lesson Plan Watch Video

Lesson Description

Let's learn how to add big numbers (up to 3 digits) without needing to carry or trade!

Video Resource

Adding 3-digit numbers (no regrouping) | 2nd grade | Khan Academy

Khan Academy

Duration: 2:39
Watch on YouTube

Key Concepts

  • Place Value (Hundreds, Tens, Ones)
  • Adding ones to ones, tens to tens, and hundreds to hundreds
  • No regrouping (no 'carrying')

Learning Objectives

  • Students will be able to identify the place value of digits in a 3-digit number.
  • Students will be able to add two 3-digit numbers without regrouping, using place value understanding.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value (hundreds, tens, and ones). Use base-ten blocks (if available) to represent numbers like 327 and 251. Ask students to identify how many hundreds, tens, and ones are in each number.
  • Video Viewing (7 mins)
    Watch the Khan Academy video 'Adding 3-digit numbers (no regrouping)'. Pause the video at key points (e.g., after Sal introduces the numbers) to ask students questions and ensure understanding.
  • Guided Practice (10 mins)
    Work through a few example problems on the board, guiding students through the process of adding ones, then tens, then hundreds. Use visual aids like drawing base-ten blocks or using color-coding to represent place value.
  • Independent Practice (10 mins)
    Provide students with a worksheet containing several 3-digit addition problems (without regrouping). Circulate to provide support and answer questions.
  • Wrap Up (3 mins)
    Review the key concepts and answer any remaining questions. Ask students to explain in their own words how to add 3-digit numbers without regrouping.

Interactive Exercises

  • Base-Ten Block Addition
    Give students base-ten blocks and have them build and add two 3-digit numbers together. This provides a hands-on representation of the addition process.
  • Place Value Chart Game
    Use a place value chart and dice. Students roll the dice to create two 3-digit numbers, then add them on the chart.

Discussion Questions

  • What does it mean to add?
  • Why is it important to line up the numbers by place value?
  • What happens if you have more than 9 in the ones place when you add?

Skills Developed

  • Place value understanding
  • Addition skills
  • Problem-solving

Multiple Choice Questions

Question 1:

What is the biggest number in the ones place?

Correct Answer: 9

Question 2:

In the number 235, what number is in the tens place?

Correct Answer: 3

Question 3:

What do we add first when adding big numbers?

Correct Answer: Ones

Question 4:

Which number shows 3 hundreds?

Correct Answer: 300

Question 5:

What is 100 + 200?

Correct Answer: 300

Question 6:

What is 1 + 7?

Correct Answer: 8

Question 7:

What is 30 + 40?

Correct Answer: 70

Question 8:

What does it mean to 'add'?

Correct Answer: Put together

Question 9:

In the number 123, what number are the 'ones'?

Correct Answer: 3

Question 10:

When we add, do numbers get bigger or smaller?

Correct Answer: Bigger

Fill in the Blank Questions

Question 1:

In the number 456, the 5 is in the ______ place.

Correct Answer: tens

Question 2:

When we add, we put numbers ___________.

Correct Answer: together

Question 3:

100 + 200 = ____________

Correct Answer: 300

Question 4:

We always start adding in the _________ place.

Correct Answer: ones

Question 5:

2 + 5 = _________

Correct Answer: 7

Question 6:

The number 600 has six ________.

Correct Answer: hundreds

Question 7:

When adding big numbers, line up the ones, tens, and ________.

Correct Answer: hundreds

Question 8:

30 + 10 = _________

Correct Answer: 40

Question 9:

The number 100 has one __________.

Correct Answer: hundred

Question 10:

0 + 8 = __________

Correct Answer: 8

Educational Standards

1.NBT.C.4:Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. 1.NBT.B.2:Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: 1.OA.A.1:Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Teaching Materials

Download ready-to-use materials for this lesson:

Student Worksheet Classroom Slides Assessment Quiz Export to Google Docs
Add to Google Classroom

User Actions

Sign in to save this lesson plan to your favorites.

Sign In

Share This Lesson

Related Lesson Plans