"Mathematics 2 class 1 part" is a workbook that helps to learn how to add and subtract two-digit numbers, decompose numbers in different ways, solve letter expressions, understand how to use rounding. More than 30 training activities and 106 bright tasks for actions with numbers. To make classes interesting, mark each completed task with a bird sticker, to be effective, write down the date when you complete the task and how long it took you to complete it.