Square Roots/Addition

Objective: To find the square root of a number. To add/subtract positive

and negative numbers.

Square Roots

• The following is the definition of a square root:

• A number a is a square root of a number b if

ab

or

ba

2

Square Roots

• The following is the definition of a square root:

• A number a is a square root of a number b if

ab

or

ba

2

525

2552

or

Square Roots

• The following is a list of perfect squares that you should memorize. It is important that you know this.

14412

12111

10010

819

648

497

2

2

2

2

2

2

366

255

164

93

42

2

2

2

2

2

Square Roots

• You also need to be able to look at it this way:

14412

12111

10010

819

648

497

2

2

2

2

2

2

636

525

416

39

24

366

255

164

93

42

2

2

2

2

2

12144

11121

10100

981

864

749

Homework

• Page 20• 9-25 odd

Adding Positive/Negative #s

• When adding two positive or two negative number together, you just add and attach the same sign as the given numbers. For example

12)7()5(

1275

Adding Positive/Negative #s

• When adding a positive and a negative number together you:

1) Ignore the signs and subtract the smaller number from the larger number.

2) Attach the sign that is the same as the larger number. For example:

• Subtract• Attach the sign 4

4711

)11(7

Subtracting Positive/Negative #s

• When subtracting numbers, you should add the opposite and follow the rules we just learned. For example:

• Add the opposite• Subtract• Attach the sign 2

2911

)11(9

119

Class work

• In groups/pairs• Page 34• 18-40 even

Homework

• Page 34• 19- 41 odd