- a.How many zeros do you attach to the right of
25 to find 25 1,000?
b. How many zeros do you attach to the right of 8 to
find 400 .2,000? - a. Using the numbers 5 and 9, write a statement that
illustrates the commutative property of
multiplication.
b. Using the numbers 2, 3, and 4, write a statement
that illustrates the associative property of
multiplication. - Determine whether the concept of perimeteror
that of areashould be applied to find each of the
following.
a. The amount of floor space to carpet
b. The number of inches of lace needed to trim the
sides of a handkerchief
c. The amount of clear glass to be tinted
d. The number of feet of fencing needed to enclose a
playground - Perform each multiplication.
a. b.
c. d.- Write three symbols that are used for
multiplication. - What does ft^2 mean?
- Write the formula for the area of a rectangle using
variables. - Which numbers in the work shown below are called
partial products?
Multiply.See Example 1.
Perform each multiplication without using pencil and paper or a
calculator.See Example 2.
- 512(1,000) 28. 673(10)
107(10,000) 323(100)
75 10 88 10,000
37 100 63 1,000
34 8 37 6
15 7 19 9
GUIDED PRACTICE
86
23
258
1 720
1,978
NOTATION
10 0 0(4)
1 25 62(1)
Multiply.See Example 3.Multiply.See Example 4.Multiply.See Example 5.Apply the associative property of multiplication to find the
product.See Example 6.Estimate each product.See Example 7.Find the area of each rectangle or square.See Example 11.Multiply.73
59
99
77
34,474 2 54,912 4
863
9
213
7
TRY IT YOURSELF
20 cm20 cm12 in.12 in.50 m22 m6 in.14 in.215 1,908 434 3,789
86 249 56 631
250 (4135) 250 (4289)
(1820) 5 (292) 50
3,002(5,619) 2,003(1,376)
602 679 504 729
64(287) 72(461)
73 128 54 173
2,700(40,000) 5,100(80,000)
130(3,000) 630(7,000)
56 200 222 500
68 40 83 30
1.4 Multiplying Whole Numbers 51