Додавання і віднімання 1

 https://www.liveworksheets.com/worksheets/uk/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%9E%D0%B1%D1%87%D0%B8%D1%81%D0%BB%D1%8E%D0%B2%D0%B0%D0%BB%D1%8C%D0%BD%D1%96_%D0%BD%D0%B0%D0%B2%D0%B8%D0%BA%D0%B8/%D0%94%D0%BE%D0%B4%D0%B0%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F_%D1%82%D0%B0_%D0%B2%D1%96%D0%B4%D0%BD%D1%96%D0%BC%D0%B0%D0%BD%D0%BD%D1%8F_%D1%87%D0%B8%D1%81%D0%BB%D0%B0__%D0%BF%D0%BE_1_bz1365254rr