Rules
When adding/subtracting fractions, what do you need your fractions to have?
Add 1/2 + 3/4
5/4 or 1 1/4
Add the decimals: 1.46 + 1.21
2.67
-1/4 - 1/4 = ?
-2/4 or -1/2
-3.5 - 1.5 = ?
-5
When adding decimals, what's the most important step when solving?
Line up the decimals.
Add 1/2 + 1/4
3/4
Add the decimals: 1.5 + 2.03 + 0.6
4.13
-3/4 - (-3/4) = ?
0
-1.75 + (-4.25) = ?
-6
When subtracting decimals, which number should be written on top?
Subtract 7/10 - 1/5
1/2
Subtract 4.52 - 2.001
2.519
1/3 - (-2/3) =
3/3 or 1
8 + (-9.8) =
-1.8
When adding a negative plus a negative, what sign will my answer have?
Negative
Subtract 2 7/8 - 1 6/8
Add the decimals: 24.6 + 2.01 + 16.98 =
43.59
2 3/4 - (-3) =
5 3/4
-9.5 - 6.5 = ?
-16
Subtraction problems can be rewritten as what?
Adding the opposite
EX: -4-5 = -4 + (-5)
Add 1/3 + 2/6 + 3/5
38/30 or 19/15 or 1 4/15
Subtract the decimals: 45.6 - 2.39
43.21
-7 1/8 - 6 3/8
-13 4/8 or -13 1/2
8.3 - (-8.3) =
16.6