Lesson 11: Beginning Subtraction
Objective
Students will be able to identify the number that is one less than a given number.
Warm up
3 - 1=2
Move 5 rings to the left side of MathLine. Show it to the students. Ask students, if we take away 1 ring,
how many rings will we have left? [4] Subtract 1 ring to show the students that 5 minus 1 equals 4. Say
it aloud together.
5 - 1=4
Continue this process with different numbers until students understand the concept of subtracting.
Student Page
Practice - Tell students to look at the picture and count the number of balloons that the clown is holding.[4]
Ask them how many balloons the clown is giving away? [1] How many balloons does the clown have left?
[3] Model the problem on MathLine. Say it aloud together.
Activities - Have students model each problem on MathLine. Have them move the number of rings
indicated to the left side. Then have them take 1 away, and write how many rings are left in the box
provided.
Challenge - Have students draw eight apples. Cross out 1 apple to show that it is being taken away. Write
how many apples are left in the box.
Extension
•
X
31
Make up a story about a family of 5 living on a farm. Tell about 1 boy who grows up and leaves
home. Encourage students to draw pictures to tell the story and write how many people will be
left in the family. Model it on MathLine and say it aloud together.
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Answers on page 45
All Rights Reserved/Howbrite Solutions
Getting Ready: Move 3 rings to the left side of MathLine. Show it to the students. Ask students, if we
take away 1 ring, how many rings will we have left? [2] Subtract 1 ring by moving it to the right to show
the students that 3 minus 1 equals 2. Point out that they can check their answer by looking at the
number on the right side of the last ring. Say it aloud together.
Name
Lesson 11: Beginning Subtraction
Practice
All Rights Reserved/Howbrite Solutions
The clown had 4 balloons.
He gave 1 away.
How many does he have now?
4-1= 3
Activities
Use MathLine to solve the problems.
1.)
6-1=
2.)
5-1=
3.)
4-1=
X
32
Name
(activities continued)
3-1=
5.)
9-1=
Challenge
Draw eight apples. Cross out 1 apple to show that it is being taken away. Write the
problem and how many apples are left.
X
33
All Rights Reserved/Howbrite Solutions
4.)