Question

Roberts heart beats about 72 times in 60 seconds . How many times does his heart beat in 15 minutes?

Answer 1

To do it just change 60 seconds to 1 minute then times 72 by 15 which would equal 1080 then your done

To check it just reverse the calculation so do 1080 divide by 15 which should equal 72

Answer 2

1. Do a proportion ( remember that 60 seconds= 1 minute)
72 times/ 1 minute= x times/ 15 minutes
2. Do 72 times 15 which equals 1,080
3. 1,080 divided by 1 equals 1,080
4. Your answer is 1,080 times