Aims for a solving speed of 4-7 seconds per example to prove the student has fully mastered the topic.
You can download the popular educational aid (3000 примеров по математике: 2 класс) by O.V. Uzorova and E.A. Nefedova for free through several online resources. This series is specifically designed to help students master basic arithmetic and reach "automaticity" in their counting skills. Where to Download (Free PDF/Online) Direct PDF Links:
O.V. Uzorova & E.A. Nefedova (Couting to 100) — Direct link to the full manual focusing on counting within 100.