Alternative

If, for example, we are praying the first decade of Joyful Mysteries according to this method, we insert the first mystery in the middle of every one of the ten Hail Marys.

"Hail Mary, full of grace, the Lord is with you. Blessed are you among women, and blessed is the Fruit of your womb, Jesus,
* Whom you conceived by the power of the Holy Spirit.*
Holy Mary Mother of God, pray for us sinners Now and at the hour of our death. Amen"

The advantage of this method is that the mystery is stated ten times during the decade, and not just once before it. In this way, it is easier to focus on the mystery to which the decade is dedicated, and it is easier to reflect on it while praying the decade.
When praying the second decade of the Joyful Mysteries according to this method, we insert the second mystery in the middle of every one of the ten Hail Marys -- and every decade is prayed likewise.