Sets to represent (math help)

Introduction for set, which represents:

Number set is a important role in mathematics. Number of records contain numbers, operations, and an equal sign, where some of the number sentences are true, and some number sets are wrong. An expression is part of a number set contains numbers and operations, but contains no equal sign. Let us learn about the set of numbers represents.

Review for number set that represents:

* 5 + 4 = 9
* 11 + 3 = 14

These are examples of the number of phrases.

If the equation satisfies the number sentence, then it is a true sentence.

* 4 + 5 = 9, which represents a true set
* 7 + 4 = 11, which represents a real set.

When Kit meets the number not the expression, then it is set wrong

* 7 + 5 = 11, representing a false set

If the number set contains no equal sign, then an expression should be.

* 5 + 4
* 3 + 7
* 4 + 11

These are examples of expressions.

Examples of record, representing numbers:

Write an expression for everyone. Then write a number sentence to solve.

Example 1:

Jim has 18 blue pins and 15 red pins. How many pins does he have in total?

Solution:

A total 18 + 15 =

18 + 15 is the expression

18 + 15 = 33 Provides the number set

This is a true sentence, because the addition of 18 and 15 33.

Example 2:

Giles bought 18 eggs. 12 Are used for breakfast. How many eggs does she have now?

Solution:

Total egg that he have now = 18-12

The term is 18-12

The number set is 18-12 = 6

This is a true sentence because is the subtraction of 18 and 12 6.

Example 3:

John has to read 12 more pages than Jimmy. Jimmy has to read 10 pages. How many pages does John have to read?

Solution:

Number of pages to read the Jimmy = 10

Number of pages to read the John = 12

Total number of pages to read John = 12 + 10

The expression is 12 + 10

12 + 10 = 22 Is the number set

This is a true sentence.

Example 4:

Jack bought 2 chocolates, 3 cookies and 9 apples. He buy as many have more apples than cookies?

Solution:

Jack bought 9 apples and 3 cookies

He bought (9-3) = 6 apples more than cookies.

Term: 9-3

Record: 9-3 = 6

To get some ideas, set that represents.

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