Week #8
Lesson 1-5
Multiplication Pattern
In this lesson you will learn How to
Mentally Multiply Whole
Numbers and Powers of 10
Let’s Warm Up
Math Warm Up
DVDs are on sale for $24 each. Ahmad writes the
expression 4 × 24 to find the cost in dollars of
buying 4 DVDs. How can you rewrite Ahmad’s
expression using the Distributive Property?
4 x ( 20 + 4 )
4 x 20 =
4x4 =
80
16
96
+
Recall
What are powers of 10 ?

1, 10 , 100, 1000 , etc. are all powers of 10

These numbers can be written as exponents
Recall
Exponent tells us how many times to multiply a
number by itself.
Power of 10 Practice :
Of the following ten numbers, five are powers
of ten, Circle them …
1,000,000
2
5
1
100.1
10.0
20,000
2
10
0
1,100
100
Warm up 2 :
Find the product ?
32 X 10 X 102 = 32,000
5 X 102 X 100 =
500
100 X 12 X 1,000 = 1,200,000
103 X 44 X 0 =
0
(8 x 3)
240
(8 x 3)
2,400
(8 x 3)
24,000
Let’s Practice Page 30
Let’s Practice Page 30
Let’s Practice Page 30
Let’s Practice Page 31
Let’s Practice Page 32
Let’s Practice Page 32
Wrap up ^_*
Omar says 20 × 10 4 is the same as 20,000. He
reasoned that since he saw 4 as the exponent he
should write 4 zeros in his answer. Is Omar
correct?