According to a survey conducted in 2007, there were an estimated 6.99 × 107 dogs, 3.61 × 107 cats, and 8.3 × 106 birds kept as pets in the United States. In this activity, you’ll add these three numbers in both standard form and in scientific notation and check whether you get the same sum. Find the total population of pet dogs, cats, and birds in standard form. estimated number of dogs
=
6.99 × 107

=
6.99 • 10,000,000
=
69,900,000

estimated number of cats
=
3.61 × 107

=
3.61 • 10,000,000
=
36,100,000

estimated number of birds
=
8.3 × 106

=
8.3 • 1,000,000
=
8,300,000