Theme 6.  Counting objects up to 20. Addition and subtraction like 18 – 1, 18 + 1

In the theme you learn:
• You will practice finding the length of line segments and writing the result of measuring;
• You will learn how to add and subtract one within 20;
• You will practice changing named numbers written in centimeters and decimeters;
• You will learn to find the correct inequalities among the given ones;
• You will practice comparing a number and an expression.