Lesson 3
Homework
Activity 1
Write the number in expanded form.
Model293 Answer: 200 + 90 + 3
85
1.
387
2.
3.
175
Activity 2
Rewrite the problem in expanded form. Do not find the sum.
Model Answer:
37
30 7
​
+ 49 S + 40 9
1.
35
+ 28
2.
47
+ 80
3.
47
+ 65
4.
95
+ 62
5.
38
+ 51
6.
90
+ 20
7.
60
+ 72
8.
82
+ 12
Activity 3
Write what the problem is asking for. Do not solve.
ModelA CD store sells about 200 CDs each day. The store manager wants to
know about how many CDs the store sells in a week. The 20 best-selling
CDs are in the rock/pop category. The store also sells a lot of movie
soundtracks.
Q: What is the problem asking for?
A: About how many CDs does the store sell in a week?
1.
The human heart beats about 72 times per minute. It pumps blood at a
rate of about 5 liters per minute. How many times does the heart beat in
an hour? 2.
The world population increases by 240,000 people daily. Population experts
want to know how much the world’s population grows in a week. Half the
world’s population lives in just 6 countries. Many of these countries are very
poor. How much does the world’s population grow in a week? Activity 4 • Distributed Practice
Add.
1.
18 7+9
Unit 1 • Lesson 3
2.
90 + 10
3.
900 + 700
4.
300 + 400
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