Multiplication by Two - How to Practice Multiplying With Playing Cards

If you want to teach a child to multiply by two, one of the easiest ways is to explain that multiplication by two is simply doubling the number.

Instead of showing the child endless multiplication tables and multiplication charts, get out a deck of cards and do the following:

• Remove the Tens, Jacks, Queens and Kings. You won’t need them.




• Take a Two of any other suit (say Spades) and place it face up on the table.




• Take the Ace through Nine of any suit (say diamonds). Shuffle them face down.




• Start turning the cards over one by one, and as you do, say what the product of that number, multiplied by two, is.




• It is important to remember not to say to yourself, “Two times (whatever number you are working on) is...” Try to just say the answer.

If you have trouble with a problem, like say, two times 9, remember, you are just doubling the number. If you have problems with that, you may want to “skip count” to the number.

To “skip count” you just count by twos, and put out a finger for each number you say. So you’d say “two” and put out one finger. Then you’d say “four” and put out another one. By the time you have nine fingers out, you should be up to “eighteen.” That is two times nine.

Divisibility Rules For Prime Divisors

studying methods that can be used to determine whether a number is evenly divisible by other numbers, is an important topic in elementary number theory.

These are shortcuts for testing a number's factors without resorting to division calculations.

The rules transform a given number's divisibilty by a divisor to a smaller number's divisibilty by the same divisor.

If the result is not obvious after applying it once, the rule should be applied again to the smaller number.

In childrens' math text books, we will usually find the divisibilty rules for 2,3,4,5,6,8,9,11.

Even finding the divisibilty rule for 7, in those books is a rarity.

In this article, we present the divisibilty rules for prime numbers in general and apply it to specific cases, for prime numbers, below 50.

Algebraic Expressions

Introduction

An algebraic expression is a combination of numbers, letters, and four basic arithmetic operations.

The numbers in an algebraic expression are called constants.

The letters in an algebraic expression are called variables. In an algebraic expression, letters always stand for numbers.

The following are some examples of algebraic expressions.

n – 2
Y / 3
11x

a + 5

Algebraic expressions may contain more than one number, more than one variable, more than one arithmetic operation.

For example:

3x – 7y + 11
5n × 9p ÷ 6

Algebraic expressions often include parentheses (brackets) and exponents.

100 Best Children Books

These 100 Best Children's Books are voted by the educators in the United States upon the online survey conducted by the American National Education Association. Parents and teachers will find it useful in selecting quality literature for children. Books for Preschoolers to Teens.

A good piece for reference. Full list please go:

http://rainbowboat.com/100best.php

Books for All Ages
The Giving Tree by Shel Silverstein
Where the Sidewalk Ends by Shel Silverstein
Little Women by Louisa May Alcott
The Wizard of Oz by L. Frank Baum
Heidi by Johanna Spyri


Books for Preschoolers
The Very Hungry Caterpillar by Eric Carle
Goodnight Moon by Margaret Wise Brown
Brown Bear, Brown Bear, What do you see? by Bill Martin