Fact Detective Academy

A comprehensive 10-day remedial sequence targeting standard 1.OA.4 (understanding subtraction as an unknown-addend problem) for first-grade students. The unit leverages highly structured ten-frames, part-part-whole visual organizers, fine-motor cut-and-paste sorting, and station-based independent task cards to move students from concrete modeling to abstract math reasoning.

Eecreamer

Frame the Facts

Days 1 to 4 focus on concrete modeling using double ten-frames. Students learn to see subtraction equations (like 10 - 7 = ?) as missing-addend addition problems (7 + ? = 10) by placing counters of two colors on ten-frames.

Part Whole Partners

Days 5 to 7 transition students to representative diagrams and fine-motor coordination. Students use part-part-whole maps, visual bar models, and cut-and-paste sorting activities to pair related addition and subtraction sentences.

Fact Detective Centers

Days 8 to 10 promote independent practice and math fluency through self-directed station work. Students use printable task cards, sorting mats, and structured recording sheets to find missing partners in real-world contexts.