App for Addition and Subtraction of Integers.Published in:International Journal for Technology in Mathematics Education, 2018, v. 25, n. 4, p. 21, doi. 10.1564/tme_v25.4.02By:Verzosa, Debbie Marie B.;De Las Peiias, Ma. Louise Antonette N.;Aberin, Maria Alva Q.;Garces, Len Patrick Dominic M.Publication type:Article