Question

write 10 simple expressions and tell how they have been formed

Answer 1

for which chapter.. ............

Answer 2

Math Term Definition. Algebraic Expression. An algebraic expression is a mathematicalphrase that can contain ordinary numbers, variables (like x or y) and operators (like add,subtract,multiply, and divide).
If you want an expression that accurately shows 7 multiplied by the sum of 4 and 2, you need to think carefully about what you must include, and the order in which you should write it.

For the example above, "7 multiplied by the sum of 4 and 2," make a list of the things you know you must include:

The numbers 7, 4, and 2.

"multiplied" tells me I will need the operation of multiplication.

"sum" tells me that I will need the operation of addition.

"Multiplied by the sum" tells me that I will need to get the sum of 4 and 2 before multiplying. Since addition usually comes after multiplication, I will need to put 4 + 2 inside parentheses.
Based on the notes listed above, we are ready to write a simple expression for the verbal problem: “seven multiplied by the sum of four and two.”

7 x (4 + 2)

4 + 2 is in parentheses to make sure this addition is done first. Without the parentheses, the operation of multiplication would have to be done first, based on the order of operation rules.

Another way you could write it is just:

7(4 + 2)

A number right next to a parentheses mark, with no operation sign in between, infers the operation of multiplication.