Addition
When we add/subtract numbers with the same signs (++ or --), what do we do?
1) Keep the Sign and 2) Add
When we add/subtract numbers with different signs (+- or -+), what do we do?
1) Take the sign of the bigger number and 2) Subtract
When we multiply/divide numbers with the same signs (++ or --), what is the sign of the answer?
Same signs, answer is POSITIVE!
When we multiply/divide numbers with different signs (+- or -+), what is the sign of the answer?
Opposite signs, answer is NEGATIVE!
When we add/subtract numbers, first we have to make sure that the __________ is the same.
Denominators (bottom numbers)
-2 + 7 =
5
-10 + (-2) =
-12
-2(-13) =
26
72 / -12 =
-6
Write the rational number as a decimal: -3/8
-0.375
5/7
11/12 - 4/12 =
7/12
1/3 x 2/3 =
2/9
12 divided by 1/2 =
24
Write each rational number as a fraction: 0.84
(reduce fraction into lowest terms)
21/25
1 1/3 + 3/4 =
(simplify your fraction into a mixed number)
2 1/12
4 4/5 - 1 2/5 =
(simplify your fraction into a mixed number)
3 2/5
4/3 (5/2) =
(simplify your fraction into a whole/mixed number)
(11/12) / (11/6) =
(simplify your fraction)
1/2
Your bank account has a balance of −$21. You deposit $50. What is your new balance?
-21 + 50 = $29
8/3 + 1 1/12 =
(simplify your fraction into a mixed number)
3 3/4
8/2 - 2/4 =
(simplify your fraction into a mixed number)
3 1/2
1 1/3 (2 1/4) =
(simplify your fraction into a whole/mixed number)
3
(2 1/4) / (3/12) =
(simplify your fraction into a whole/mixed number)
Luke’s pet: 1.5 cups of dry food and Angelina’s pet: 9/5cups of dry food.
Based on these averages, how many more cups of dry food will Angelina’s pet have eaten than Luke’s pet will have eaten over 21 days?
1.8 - 1.5 = 0.3 (21) = 6.3 cups