Read the story. Talk through the numbers.

Kids do best when you do the math together.

The Heartbeat That Can't Be Beat

The Heartbeat That Can't Be Beat

Hummingbirds are amazing. They can hang in the air over a flower long enough to suck nectar for dinner. To do this, they flap their wings 80 times per second. That is such hard work that their hearts beat more than 1,000 times a minute! Our hearts beat just 60 to 100 times a minute while resting. Even when you exercise, your top heart rate should be 220 minus your age. Do the math below to find out what that is!
Named Wirecutter’s Best Online Learning Games for Kids!