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# Subtract + and – fractions and decimals. - PowerPoint PPT Presentation

Subtract + and – fractions and decimals. Warm-Up. Find the value of each expression. −3 +(− 4) 10 − (−5) −25 − 10 − 8.3 + 45.2. RULES. 5. 2 + 3. Change subtract into add add the opposite – 2.2 – 4.2 – 2.2 – (4.2) – 2.2 + ( – 4.2) Follow the rules for adding

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## PowerPoint Slideshow about ' Subtract + and – fractions and decimals.' - cadman-carpenter

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Presentation Transcript

Find the value of each expression.

• −3 +(− 4)

• 10 − (−5)

• −25 − 10

• − 8.3 + 45.2

5

2 + 3

– 2.2 – 4.2

– 2.2 – (4.2)

– 2.2 + (– 4.2)

neg + pos = Subtract

pos + neg = Subtract

1

3 – 2

Find the value of .

• Make improper fractions.

• Rewrite with common

denominators.

Bromine has a boiling point of 58.8⁰ C and a melting

point of –7.2⁰ C. What is the difference between the

boiling point and the melting point?

• Write the problem: 58.8 – (–7.2)

• Add the opposite: 58.8 + 7.2

• Add by lining up the decimals.

Find each difference.

• 18.7 − (−2.8)

Science and math are related in many ways. What is one

way you have observed that math and science overlap?