 basic math operations. Adding numbers gives you a total. The total is always a bigger number. Subtract. When you subtract, you start with a bigger number. Then you take away a smaller number. The result is the difference between the two numbers. Multiply. Imagine you are in college. There are four classrooms. In each classroom, there are 20 students. Altogether, there are 80 students. Divide. When you divide, you split into equal groups. Imagine you have 20 pieces of chocolate and four friends. You want to be fair. Each friend will get five pieces of chocolate. Digit. The individual parts of a number are called digits. The number 34 has two digits. The number 587 has three digits. Pattern. Patterns are numbers that follow a rule. In this pattern, each number is twice as big as the number before or two times the number before. Horizontal. Many things around us are horizontal. Streets, highways, and rivers. They are long or wide, but not high or tall. Vertical. Many things around us are vertical. People walking. Trees. Mountains and tall buildings. They are tall or high, but not long or wide. Odd. How many planes do you see? Three. Three is an odd number. Odd numbers cannot be divided into equal groups. Even. How many planes do you see? Four. Four is an even number. Even numbers can be divided into equal groups. Value. A value is the total amount of how much something is worth. In math, a value is the number total you get when you add, subtract, multiply, or divide numbers. Equal sign. The equal sign is a mathematical symbol. It separates two sides. It means that each side is equal in value. The end.