Problem
There are around \( 7.6 \times 10^{8} \) cows and \( 4.9 \times 10^{7} \) horses in the United States. How many cows and horses in total are in the United States? \( 7.11 \times 10^{8} \) 8. \( 09 \times 10^{8} \) \( 7.11 \times 10^{1} \) \( 8.09 \times 10^{7} \)
Solution
Step 1 ：\( 7.6 \times 10^{8} + 4.9 \times 10^{7} \)
Step 2 ：\( (7.6 \times 10^{1}) \times 10^{8} + (4.9 \times 10^{0}) \times 10^{8} \)
Step 3 ：\( 8.09 \times 10^{8} \)
