Adding Fun with Two-Digit Numbers!

Math Grades 1st Grade 2:43 Video
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Lesson Description

Learn how to add two-digit numbers without regrouping. We'll practice lining up numbers and adding the ones and tens places.

Video Resource

How to Add 2 Digit Numbers Without Regrouping - Math for Kids!

Miacademy Learning Channel

Duration: 2:43
Watch on YouTube

Key Concepts

  • Place Value (Tens and Ones)
  • Adding two-digit numbers without regrouping
  • Lining up numbers correctly by place value

Learning Objectives

  • Students will be able to identify the tens and ones place in a two-digit number.
  • Students will be able to add a two-digit number and a one-digit number without regrouping.
  • Students will be able to add two two-digit numbers without regrouping.
  • Students will correctly align numbers by place value when adding.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing place value (tens and ones). Ask students to identify the tens and ones in different numbers (e.g., What is the tens place in 23? What is the ones place in 15?).
  • Video Viewing (5 mins)
    Watch the "How to Add 2 Digit Numbers Without Regrouping - Math for Kids!" video by Miacademy Learning Channel. Encourage students to pay attention to how the numbers are lined up and how the ones and tens places are added separately.
  • Guided Practice (10 mins)
    Work through a few example problems on the board, demonstrating how to line up the numbers and add the ones and tens places separately. Use examples similar to those in the video (e.g., 21 + 6, 12 + 34). Emphasize the importance of keeping the ones and tens places aligned.
  • Independent Practice (10 mins)
    Give students a worksheet with similar addition problems to solve on their own. Circulate the classroom to provide assistance and answer questions.
  • Wrap-up (5 mins)
    Review the key concepts of the lesson. Ask students to explain in their own words how to add two-digit numbers without regrouping.

Interactive Exercises

  • Place Value Sort
    Provide students with cards showing two-digit numbers. Have them sort the cards into piles based on the number in the tens place or the number in the ones place.
  • Addition Bingo
    Create bingo cards with sums as answers. Call out addition problems (e.g., 12 + 5). Students mark the answer on their bingo cards. The first student to get bingo wins!

Discussion Questions

  • Why is it important to line up the numbers correctly when adding?
  • What is the ones place? What is the tens place?
  • Can you explain how to add the ones place first, then the tens place?

Skills Developed

  • Addition
  • Place Value Understanding
  • Problem Solving
  • Number Sense

Multiple Choice Questions

Question 1:

What is 10 + 5?

Correct Answer: 15

Question 2:

What is 23 + 4?

Correct Answer: 27

Question 3:

What is 11 + 11?

Correct Answer: 22

Question 4:

What place is the 3 in, in the number 35?

Correct Answer: Tens

Question 5:

What place is the 7 in, in the number 17?

Correct Answer: Ones

Question 6:

What is 12 + 20?

Correct Answer: 32

Question 7:

Which sum is bigger? 14 + 3 or 11 + 4?

Correct Answer: 14 + 3

Question 8:

What is 5 + 4?

Correct Answer: 9

Question 9:

What is 30 + 1?

Correct Answer: 31

Question 10:

What is 16 + 2?

Correct Answer: 18

Fill in the Blank Questions

Question 1:

The number 25 has 2 _____ and 5 ones.

Correct Answer: tens

Question 2:

When adding, line up the _____ place and the ones place.

Correct Answer: tens

Question 3:

13 + 6 = _____.

Correct Answer: 19

Question 4:

10 + 10 = _____.

Correct Answer: 20

Question 5:

The answer to an addition problem is called the _____.

Correct Answer: sum

Question 6:

2 + 2 = _____.

Correct Answer: 4

Question 7:

What number comes after 9? _____

Correct Answer: 10

Question 8:

We always start adding with the _____ place.

Correct Answer: ones

Question 9:

A number with two digits has a tens place and a _____ place.

Correct Answer: ones

Question 10:

1 + 8 = _____

Correct Answer: 9

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. CCSS.Math.Content.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: CCSS.Math.Content.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

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