# 2TH §4.2 Adding and subtracting Square Roots

Entry Ticket
Calculate if possible and without using a calculator

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Slide 1: Slide
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This lesson contains 13 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

Entry Ticket
Calculate if possible and without using a calculator

#### Slide 1 -Slide

§4.2 Adding and subtracting square roots ...
is on the menu today!

#### Slide 2 -Slide

Recap: Opposite numbers

#### Slide 3 -Slide

Adding and subtracting square roots

#### Slide 4 -Slide

Adding and subtracting square roots
....... works the same as adding (+) and subtracting (-) like terms:

Calculate

3+3+3+3=
A
12
B
81
C
43
D
34

#### Slide 6 -Quiz

Adding and subtracting square roots
You can only add up (+) and subtract (-) like terms

#### Slide 8 -Slide

Write as short as possible

y=x+5+x+7
A
y=2x+12
B
y=2x+5+7
C
y=2x+12
D
y=35x2

#### Slide 9 -Quiz

Adding and subtracting square roots
Writing formulas as short as possible  with square roots
works the same as with like terms.

#### Slide 10 -Slide

Write as short as possible

P=15a+6b+5a2b
A
P=20a+8b
B
P=24ab
C
P=20a+4b
D
cannot be written any shorter

#### Slide 11 -Quiz

Homework
Do §4.2 exercises 10, 11, 12, 13 and 14
Check your answers with the solution book!

#### Slide 12 -Slide

What did you learn today?