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.