Acknowledgement: Inspired by John Ulbright's applet "Adding Fractions - Visual" ([url=https://www.facebook.com/l.php?u=https%3A%2F%2Fggbm.at%2FszwBQ7wa&h=8AQFR5QXwAQGZFWnP0sOylauh5ByM-Q7y7XyBQ4Jbz_yW0w&enc=AZMtyFRU-F7bVQSMciR4EeJf-PRCih-D-97pDRZNMRDzWz2VAu47c-TowLTeEB6BRzJ-WBkWFSIGj6hH03A9De7C4GExAEG72IJ44HVWuRpqU8ybwfQM1ZIj6JdmAX_zNcDsAIlQX0m-g8tc2UTSt7qEzrgg5UA9MEholoVpglcLcsxndrT5kH8Bdspjby0PFZJSoHN7-qC4e3W6JAJmlapk&s=1]https://ggbm.at/szwBQ7wa[/url])