Theme 6.  Kilogram. Problems about measuring mass in kilograms

In the theme you learn:
• You will learn about the value "mass", its unit of measurement – kilogram and its short sign;
• You will practice to find out by looking which animal is heavier or lighter;
• You will learn to solve problems with named numbers written in kilograms;
• You will improve your skills to choose the right solution for a problem;
• You will practice to find the weight of a box using a picture;
• You will calculate addition and subtraction expressions "in a chain".