Extended Multiplication Facts
5.1 Extended Multiplication Facts
 Measure your pencil.
 Record the data.
 Pull out your whiteboards, and answer this question.
 If I bought 6 apples that cost 40¢ each, how much
would I spend?
5.1 Extended Multiplication Facts
 40¢ + 40¢ + 40¢ + 40¢ + 40¢ + 40¢
 6 x 4 (tens)
24 (tens)
 6 * 40
 In this lesson, we will extend our work with basic
multiplication facts to develop a shortcut for working
with multiples of 10.
5.1 Extended Multiplication Facts
 Please pull out pages 106 & 107
 Page 106 goes over how to multiply a one and a ten.
 Page 107 goes over how to multiply a ten and a ten.
 Solve the extended facts for the example problem on
page 106
5.1 Extended Multiplication Facts
 Extended Facts: 2*30 = 60, or 20 * 3 = 60
 What does this mean?
 What did you do?
 Complete the rest of the page.
 Let’s share what we did!
5.1 Extended Multiplication Facts
 1. Original Fact ________________
 Extended fact _________________
 2. Original fact: ________________
 Extended Fact: ________________
 3. Original fact: ________________
 Extended fact: _________________
 4. Original Fact: ________________
 Extended Fact: ________________
5.1 Extended Multiplication Facts
 What shortcut can you use to multiply ones by tens,
such as 3 * 60?
 Let’s practice some more with our whiteboards.
5.1 Extended Multiplication Facts
 7*20
 6*60
 4*50
 1*10
 70*9
5.1 Extended Multiplication Facts
 Now let’s work with multiplying ten by ten
 Try the example of journal page 107. Solve the
extended fact.
5.1 Extended Multiplication Facts
 Original Fact: 3 * 5 = 15
 Extended Fact: 30 * 50 = 1500
 What does this mean?
 What did you do?
 Think: 3 (tens) * 5 (tens).
 Complete the rest of the page.
 Let’s share what we did!
5.1 Extended Multiplication Facts
 1. Original Fact ________________
 Extended fact _________________
 2. Original fact: ________________
 Extended Fact: ________________
 3. Original fact: ________________
 Extended fact: _________________
 4. Original Fact: ________________
 Extended Fact: ________________
5.1 Extended Multiplication Facts
 What shortcut can you use to multiply tens by tens,
such as 40 * 60?
 Let’s practice some more with our whiteboards.
5.1 Extended Multiplication Facts
 70*20
 60*60
 40*50
 10*10
 70*90
5.1 Extended Multiplication Facts
 Homework: Handout Page 139