Rules
When adding/subtracting fractions, what do you need?
Common denominators
Add 1/2 + 3/4 as a mixed number or improper fraction
5/4 or 1 1/4
Add the decimals: 1.46 + 1.21
2.67
Subtract the fractions 6/12 - 4/12
2/12 or 1/6
Subtract 5.2 - 3.52
1.68
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
Subtract 5/6 - 5/8
5/24
Add 198.306 + 2.21 + 51.71 + 5.8 =
258.026
Multiplying a decimal by 100 moves the decimal point to the...
Right 2 times
Subtract 7/10 - 1/5
1/2
Subtract 4.52 - 2.001
2.519
Add the fractions 2 3/5 + 3 1/2
6 1/10 or 61/10
Subtract 6.21 - 0.3 -1.67=
4.24
When adding/subtracting mixed numbers, what can we use to convert them to improper fractions?
The "C-Trick"
Subtract 2 1/8 - 1 1/4
7/8
Add the decimals: 24.6 + 2.01 + 16.98 =
43.59
Subtract the fractions 2 1/8 - 1/4 in simplest form as a mixed number
1 7/8 or 15/8
Add 3.25 + 1.2
4.45
When adding and subtracting decimals, what should one do after solving the problem?
Check your work!
Add 1/3 + 2/6 + 3/5
19/15 or 1 4/15
Subtract the decimals: 45.6 - 2.39
43.21
Add 1 1/2 + 3 2/7
67/14 or 4 11/14
Find 32 - 8.26 + 2.1
25.84