Oh my Jesus...

The SACRIFICE Prayer
13 June 1917

Oh my Jesus,
I offer this for love of Thee,
for the conversion of sinners,
and in reparation for
the sins committed against
the Immaculate Heart of Mary.
That prayer is to be said, Mother Mary told the children, with every sacrifice offered to God.

But that was not the only prayer taught to the children, nor was it first.

In the spring of 1916, these three children were visited by "the Guardian Angel of Portugal". St Michael (the Guardian Angel of Portugal since 1139, whose feast was official as of 1504) taught them this prayer:

The PARDON Prayer

My God,
I believe,
I adore,
I hope and
I love Thee!

I ask pardon for those who
do not believe,
do not adore,
do not hope and
do not love Thee.

In either September or October 1916, St Michael prostrated himself before the Blessed Sacrament, which was suspended mid-air. While prostrated, he prayed:

The ANGEL’S Prayer

O Most Holy Trinity –
Father, Son and Holy Spirit –
I adore Thee profoundly.

I offer Thee
the most precious Body, Blood,
Soul and Divinity of Jesus Christ,
present in all the tabernacles of the world,
in reparation for the outrages, sacrileges, and indifferences
whereby He is offended.

By the infinite merits of
the Sacred Heart of Jesus and
the Immaculate Heart of Mary
I beg the conversion of poor sinners.
It is also known as the Act of Reparation to The Holy Trinity. The next year, the three children were again visited - by the Holy Mother herself. They received three more prayers from her:

The EUCHARISTIC Prayer13 May 1917

Most Holy Trinity,
I adore you!

My God, my God,
I love you in the
Most Blessed Sacrament.

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The DECADE Prayer (the FATIMA Prayer)
13 June 1917

O sweet Jesus,
forgive us our sins,
save us from the fires of hell,
lead all souls to Heaven,
especially those most in need of Thy mercy.
Amen.
These 5 prayers are the Fatima Prayers - only one of which is used in the Rosary - the Decade Prayer is said after you say the Little Doxology (Glory Be), after each set of ten Hail Mary's.

The next two prayers were shown to Sr Lucia by the Christ Himself, in 1931 at Rianxo, Spain:

The CONVERSION Prayer

By your pure and
Immaculate Conception, O Mary,
obtain the conversion of Russia,
Spain,
Portugal,
Europe
and the whole world!

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The SALVATION Prayer

Sweet Heart of Mary,
be the salvation of Russia,
Spain,
Portugal,
Europe
and the whole world.