Doubles . Learning addition basic facts with doubles is an important step in developing fluency with numbers. Since doubles (e.g., 1 1, 2 2, 3 3) follow a simple and recognisable pattern, they are one of the first sets of facts students learn, along with facts that make 10. . Using concrete materials, such as counters, ten-frames, or number mats, helps students visualise and physically manipulate the numbers, reinforcing their understanding. . Mastering these facts with hands-on experiences buil