Prayer
Christians and Jew's alike pray to communicate with God, they believe that this brings them closer to Him, pray can be seen as a kind of 'conversation' between God. Of the two religions, Judaism has more formal prayers. In Judaism there are set times for prayers; morning, noon, evening and at meal times and nearly all prayers are formal written text. Christians on the other hand have no set time for prayer, though some people may choose to pray at certain times. They also have formal written prayers, however many Christians use extemporary prayer - praying in their own words rather than from a written text. Christian prayers are characteristically offered to God, thru Jesus Christ under the leading of the Holy Spirit, on that basis that Jesus cleared away the 'blocks' between God and human beings. The best known Christian prayers is The Lord's Prayer, there are many different variations on The Lord's Prayer, below is an example:

"Our Father in Heaven,
Hallowed be thy name,
your Kingdom come,
your will be done 
    on earth as it is in Heaven.
Give us today our daily bread
forgive us our debts,
    as we also have forgiven our debtors
and lead us not into temptation
but deliver us from the evil one.  Amen."

                                       (Matthew 6:9-13)

The two religions both mark the end of the prayer by saying 'Amen', and most prayers (formal or extemporary) contains; praise and adoration of God, regret for sins and seeking of forgiveness, thanksgiving for the blessing of God and frequently a specific request of God. This form is evident in The Lord's Prayer.  

Sabbath is the Jewish holy day of the week, this is a day without work and falls on Saturday, while the Christian's holy day lands on Sunday. On this day the believers go to the Synagogue and Church respectively to pray and listen to sermons. Special services are often held during the year to celebrate certain events.

These two religions both use visible symbols of prayer, for the Jew's its the Tallit, Tefillin and the Yarmulka. They also use prayerbooks that contain prayers used during worship. Christians use the Rosary, crucifix and icons as aids of prayer and worship.