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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