MATH PUZZLE: Can you replace...

An old-time pastor was riding furiously down the road, hurrying to get to church on time. Suddenly, his horse stumbled and threw him to the ground.Lying in the dirt, his body wracked with pain, the pastor called out, “All you angels in heaven, help me get up on my horse!”With extraordinary strength, he leaped onto the horse’s back—and fell off the other side.From the ground again, he called out, “All right, just half of you angels this time!”