subtract + and – fractions and decimals
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Subtract + and – fractions and decimals.
Find the value of each expression.
1. −3 +(− 4)
2. 10 − (−5)
3. −25 − 10
4. − 8.3 + 45.2
5. )1(5 32
31
1. Change subtract into add
add the opposite – 2.2 – 4.2– 2.2 – (4.2)
– 2.2 + (– 4.2)
Follow the rules for addingneg + neg = ADD
answer is negativeneg + pos = Subtractpos + neg = Subtract
23
)3(2
)3(2
Find the value of .
Add the opposite.
Make improper fractions.
Rewrite with common denominators.
Add and simplify.
21
31 26
21
31 26
3
19136
2
2
3
19
658
6
53
6
15
6
38
65
21
31 826
2
5122
3
3
2
5
Bromine has a boiling point of 58.8 C and a ⁰ melting point of –7.2 C. What is the ⁰ 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.
0.66
2.7
8.58
Find each difference.
1. 18.7 − (−2.8)
2.
3.
8
3
4
3
61
32 13
Science and math are related in many ways. What is one way you have observed that math and science overlap?