Rules
AS Decimals
AS Fractions
Solve Equations
Simplify
100
Same signs...
add and keep
100
0.001 + 1.001 = ?
1.002
100
(1/5) + (3/5) =
4/5
100
m = 2.05 + (2.05)
m = 4.1 or 4 1/10
100
4.05y + 6.005y
10.055y
200
Different signs...
Subtract
200
3.05 - 1.05 =
2.00
200
(5/4) + (5/4) =
2 1/2
200
c = (2/5) + (8/5)
c = 2
200
(3/5)d - (1/5)d
(2/5)d
300
To add and subtract decimals you must...
Align decimals
300
3.5 - 2.05 =
1.45
300
(17/32) + (-9/32) =
1/4
300
f = (3/2) + (-1.5)
f = 0
300
2.5e + 5.2e - 10.5e
-2.3e
400
Keep the sign of the...
Greater absolute value.
400
-45.05 + 25.55 =
-19.5
400
(-25/20) - (-10/20) =
-3/4
400
h = 2.8 + (14/5) + (-1.4)
h = 4.2 or 4 1/5
400
(6/7)x + (6/7)x + (4/7)
16/7 = 2 2/7
500
You can add like fractions because they have
the same denominator.
500
45.98 + 0.005 - 30.09 =
15.895
500
(6/9) + (-3/9) - (-1/9) =
4/9
500
If a = 3/4 and b = 5/4 and c = 1.25, what is a + b + c ?
a + b + c = 3.25 or 3 1/4
500
6.07x + 10x + (-5.4y) - (-3.2y)
16.7x - 2.2y
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