Roberto and Valerie are jumping rope at recess. Roberto can skip 4,200 times an hour. Valerie can skip 80 times a minute. If they jump rope for fifteen minutes straight, how many skips will they total?
Roberto skips 70 times per minute because 4,200 / 60 = <<4200/60=70>>70.
Together they skip 150 times a minute.
They will skip 2,250 times because 150 x 15 = <<150*15=2250>>2,250
#### 2,250