Question

downhill skiing burns about 600 calories per hour. How many calories will you burn if you downhill ski for 3.5 hours?

Answer 1

2100 calories
We find this by multiplying 600 times 3.5
An easy way to do this is multiplying 600 times 3 (1800) and the adding half of 600 (300) to your number for the final number of 2100 calories.