Question: 1. Choose a method. Use either rounding or compatible numbers to estimate each answer. 142 - 720 2. Use mental math to find the sum.

1. Choose a method. Use either rounding or compatible numbers to estimate each answer.

142 - 720

2. Use mental math to find the sum.

32 + 48

3. The Chinese kwan note was used in the 1300s. It was about 93 centimeters long. The United States dollar bill is almost 16 centimeters long. About how many times longer was the kwan note?

4. You are going on a vacation 1,038 miles away. The first day you travel 284 miles. The second day you travel 326 miles. About how much farther do you have to go?

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