Do you give 10% of your income to the work of God? Do you think by doing so you are fulfilling the Mosaic command to tithe? Think again. Israelites were commanded to pay upwards of ~23% in tithes, not a mere 10%.
The Mosaic Law required the children of Israel to pay three different tithes: levitical tithe (Lev 27:30-32; Num 18:21,24), annual festival tithe (Dt 14:22-27), and tri-annual poor tithe (Dt 14:28-29). The levitical tithe was the standard tithe. It required all Israelites to give 10% of their increase (crops, fruit, livestock) to the Levites. This tithe was probably offered sporadically throughout the year.