Increase Math Fact Fluency! Using QR codes is motivating, and self checking!! Valentine themed Self Checking Subtraction Facts from 20- Minuends (top numbers:20,19,28,17,16,15) Subtrahend (bottom numbers: 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) My class loves practicing math facts with QR Codes! QR (Quick Response) codes can be scanned with any device that has the scan app downloaded. Students write their differences on the coordinating numbered box on the recording sheet. A variet