Dokumen.pub (Part 2) — Provides "3000 New Examples" Part 2 for download.
Primarily covers counting within 100 , which is a core 2nd-grade requirement.
O.V. Uzorova & E.A. Nefedova (Couting to 100) — Direct link to the full manual focusing on counting within 100.
Aims for a solving speed of 4-7 seconds per example to prove the student has fully mastered the topic.