Upload
alexander-clark
View
222
Download
3
Embed Size (px)
Citation preview
How much does owning a pet cost?
Pets need lots of supplies!
In this lesson you will learn how to add up to four 2-digit numbers
by using place value.
Let’s Review
Hundreds Tens Ones
2 6 7
200 60 7
Let’s Review
Numbers can be represented in different ways.
3 tens and 2 ones 2 tens and 12 ones
=
32
Let’s Review
Addends can be grouped in any order to get the same sum.
(2 + 2) + 3 (3 + 2) + 2=
A Common Misunderstanding
Thinking that numbers must be added in order.
+6 + 4 = 4 + 6
Numbers can be added in any
order to get the same sum.
Core Lesson
59 + 17 + 25 + 43
Crate - $59Collar - $17Leash - $25Toys - $43
How much will owning a dog cost?
I can use place value to help me
add.50 +10 + 20 40+ = 120
9 +7 +5 + 3
50 + 50
1014 + = 24
120 +24$144
Core Lesson
65 + 22 + 30 + 37
Will my supplies cost more or less
than a dog’ssupplies?
Tank - $65Plants - $22Pump - $30More Fish - $37
60 + 20 + 30 + 30 80 + 60
8 tens + 6 tens = 14 tens
=140
Now I can add the ones together.
5 + 2 + 77 + 7
=14
140 +14$154
Core Lesson
25 + 8 + 7 + 11
How much will my supplies
cost?
Cage - $25Wheel - $8Bedding - $7Water Bottle - $11
I can first add the tens
together and then the ones.
20 + 10
= 305 + 8 + 7 + 1 5 +
16
8 + 8 is 16.
10 + 11
= 21
5 + 16 can be thought of as 1 ten + 11 ones.
30 +21$51
In this lesson you have learned how to add up to four 2-digit
numbers by using place value.