To help students memorize math facts

To improve students' ability to solve problems quickly and flexibly

To prepare students for standardized tests

To make math class more fun

To break numbers into smaller, more manageable parts

To memorize math facts

To use a calculator more effectively

To write numbers in expanded form

A number that is a prime number

A number that is easy to add or subtract

A number that is easy to multiply

A number that is a multiple of 5

By breaking numbers into smaller parts

By using a calculator

By using multiplication instead of addition

By adding and then subtracting the same number to simplify the problem

Multiply the result by 2

Subtract the same amount from the minuend

Add the same amount to the minuend

Divide the result by 2

Subtraction

Multiplication

Division

Addition

Subtract the smaller number from the larger number

Add the two numbers together

Count up from the smaller number to the larger number

Multiply the two numbers

Decomposition

Compensation

Adding Up

Standard Algorithm

Add the same number to both

Subtract the same number from both

Add to one and subtract from the other

Multiply both by the same number

Because it uses multiplication

Because it uses division

Because it changes the numbers to easier values

Because it keeps the difference between the numbers the same