Subtract and fractions and decimals
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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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Presentation Transcript

Warm up
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

    neg + neg = ADD

    answer is negative

    neg + pos = Subtract

    pos + neg = Subtract

1

3 – 2


Example 1
Example 1

Find the value of .

  • Add the opposite.

  • Make improper fractions.

  • Rewrite with common

    denominators.

  • Add and simplify.


Example 2
Example 2

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.


Exit problems
Exit Problems

Find each difference.

  • 18.7 − (−2.8)


Communication prompt
Communication Prompt

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

way you have observed that math and science overlap?


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