Expressions and Equations

Books created by Elementary students (2nd to 6th graders) in the Advanced Math Program at Latin American School in Monterrey, Mexico.

BOOKS BY AMP STUDENTS

When you do an operation you always should use PEMDAS. What is PEMDAS exactly? Well it stands for: Parentheses Exponets Multlication (from left to right) Division (from left to right) Addition (from left to right) Subtraction (from left to right) So let me explain it. First you do the operation in parentheses (if there is one). Then you do the operation with exponents (if there is one). After you do multiplication and division. What do we mean from left to right? Why that is because if there is a multiplication first you do it first, but if there is a division first you do it first. Then we go on to addittion and subtraction and it is the same if there is a Addition first you do it first but if there is a subtraction you do it first. That is PEMDAS.

So as you see if you want to do the operation right you gotta use PEMDAS.

PEMDAS can also be Please Excuse My Dear Aunt Sally.

Example 1 A number of apples divided by 12 baskets = a/12

Example 5 Dan is 12 in. taller than Jay. Use x for Jay’s height. Which expression shows Dan’s height? The answer is A

Example 3 Three times the cost of one hat = 3h

Example 4 3+W= a number w plus 3

Expressions and Equations by 4th Grade AMP

If you can't memorize PEMDAS, you can remember by the phrase "Please Excuse My Dear Aunt Sally"

You have to follow PEMDAS rule. First parentheses, then exponents, multiplication and division from left to right, addition and subtraction from left to right.

You can't make mistakes. If you do, the operation is wrong. Be sure to follow PEMDAS rule.

Barbie Ana Lucía Ximena Esteban Rommel

Difference between a Numerical Expression and an Algebraic Expression

An&nbsp;algebraic expression&nbsp;is a mathematical&nbsp;phrase&nbsp;that can have numbers, variables (like x or y) and operators (like add,subtract,multiply, and divide). Here are some&nbsp;algebraic expressions: a + 1. a - b. 3x.

ALGEBRAIC AND NUMERIC EXPRESSIONS.

An algebraic expression is a mathematical phrase involving variables,numbers,and operations.

When you look at a problem with numbers, you are most likely seeing a&nbsp;numerical expression. A&nbsp;numerical expression&nbsp;is a mathematical sentence having only numbers and one or more operation symbols.

                                            What is an expression?

Numbers, symbols and operators (such as + and ×) grouped together that show the value of something.

There are two types of expressions a numerical expression, and an algebraic expression.

The pemdas is order of operation first start with the parenteses if it said you add you add if it said multiply you multiply anything than the exponents is the same as parenteses is add you add but the exponents are different  you need to multiply and you know how many times you need to multiply if the six is the number the other number is the times you multiply if is six you need 6*6*6*6*6*6 then multiply the number that said multiply then the numbers that said divide you divide then you add the numbers then subtract the numbers then it will give you the awnser but if ther no one of this ones parenthesis, exponent, multiplication, division, addition, subtraction so you just continue the pattern

The correct way to multiply and subtracting or adding mixt is like this- Example: 3+8 x 5, first you have to multiply 8 times 5 then add 3, some people may first add 3 plus 8 and then times 5 but that would be wrong because the order is that first you multiply and then add, but if it is like this- Example: (6+8)x6, in this case first add 6 and 8 and then that times 6, just in this case that you have a parentheses it would be first add and then multiply. You have to do it like that because then everything will be wrong, that is the order of operations you have to do.

correct way- 6+2 x 4, 2 times 4 is 8 plus 6 that is 14 incorrect way- 6+2 x 4, 6 plus 2 times 4 that is 32, that is wrong

You have to follow PEMDAS rule. First parantheses, then equations, multiplication and division from left to right, addition and subtraction from left to right.

The pemdas is an order of operations the operation first start with the parentheses then with the exponents then multiply, divided, add, and subtract I will give you one exapmple

WHAT IS AN ALGEBRAIC AND NUMERIC EXPRESSION?

Examples of algebraic and numerical expressions

1. A number of apples divided by 12 baskets

5. Dan is 12 in. taller than jay. Use x for Jay’s height. Which expression shows Dan’s height

Name

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