＜p＞Practice and hone important addition skills. Find inside twenty addition problems with complete solutions that educate the student in the addition process. The book also includes four bonus word problems with complete explanations and answers. Easily navigate the links from the problem list to view the solution, and then return to the practice problems to select another. Problems start with low difficulty and gradually increase to challenging. Most appropriate for 3rd grade students.＜/p＞画面が切り替わりますので、しばらくお待ち下さい。 ※ご購入は、楽天kobo商品ページからお願いします。※切り替わらない場合は、こちら をクリックして下さい。 ※このページからは注文できません。