Theme 9.  Subtraction of numbers. The sign "–"

In the theme you learn:
• You will practice choosing the next and neighboring numbers for a given number;
• You will practice comparing groups of objects and the corresponding numbers;
• You will learn about the arithmetic operation of subtraction and the sign "−";
• You will find out how to read a subtraction equation correctly;
• You will learn to make subtraction equations using schematic pictures;
• You will practice calculating subtraction expressions.